# Usage Questions

**URL:** https://discourse.flucoma.org/c/usage-questions/9.md

[Latest](https://discourse.flucoma.org/latest.md) · [Categories](https://discourse.flucoma.org/categories.md)

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## [About the Usage Questions category](https://discourse.flucoma.org/t/about-the-usage-questions-category/33)

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**Author:** [@tremblap](https://discourse.flucoma.org/u/tremblap)\
**Replies:** 0

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This is a place to ask any question from a usage perspective: a task you want to discuss the different ways to achieve.

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## [Large Corpus Analysis in SuperCollider](https://discourse.flucoma.org/t/large-corpus-analysis-in-supercollider/2826)

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**Author:** [@areacode](https://discourse.flucoma.org/u/areacode)\
**Replies:** 11\
**Last updated:** [August 17, 2026, 6:29am UTC](https://discourse.flucoma.org/t/large-corpus-analysis-in-supercollider/2826 "2026-08-17T06:29:03Z")

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Hi all - I’d like to work with a body of files totaling about 200GB, but ultimately analyzing in a similar way to that discussed in the 2D Corpus Explorer demo. My understanding is that each buffer is loaded to the ser…

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## [FluidWaveform Selection](https://discourse.flucoma.org/t/fluidwaveform-selection/2824)

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**Author:** [@areacode](https://discourse.flucoma.org/u/areacode)\
**Replies:** 5\
**Last updated:** [August 15, 2026, 7:16am UTC](https://discourse.flucoma.org/t/fluidwaveform-selection/2824 "2026-08-15T07:16:47Z")

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Hi out there - I was hoping to use FluidWaveform for a project where I could select and playback areas of a waveform, based on the visual information. I don’t believe this functionality is built-in to FluidWaveform and …

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## [Comparing distances between MFCCs](https://discourse.flucoma.org/t/comparing-distances-between-mfccs/2820)

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**Author:** [@tremblap](https://discourse.flucoma.org/u/tremblap)\
**Replies:** 10\
**Last updated:** [July 27, 2026, 5:11pm UTC](https://discourse.flucoma.org/t/comparing-distances-between-mfccs/2820 "2026-07-27T17:11:55Z")

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If anyone wants to try my (supercollider) (dirty) patch, I have done a subjective comparison of nearest-neighbour, group-scaled vs dimension-scaled, 2d (via UMAP) vs 13d for each. The idea is that I browse for a point in…

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## [General question about analysis & min max frequency](https://discourse.flucoma.org/t/general-question-about-analysis-min-max-frequency/2821)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 2\
**Last updated:** [July 26, 2026, 1:23pm UTC](https://discourse.flucoma.org/t/general-question-about-analysis-min-max-frequency/2821 "2026-07-26T13:23:20Z")

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Hello I noticed that my corpus analysis (mfcc) is more efficient when setting minimum & maximum frequency to 600hz & 10000hz, for classification using kdtree. I’m about to record again the whole corpus, should I filter …

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## [1-question survey for users and teachers using Max and Pd](https://discourse.flucoma.org/t/1-question-survey-for-users-and-teachers-using-max-and-pd/2817)

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**Author:** [@tremblap](https://discourse.flucoma.org/u/tremblap)\
**Replies:** 0\
**Last updated:** [July 6, 2026, 12:29pm UTC](https://discourse.flucoma.org/t/1-question-survey-for-users-and-teachers-using-max-and-pd/2817 "2026-07-06T12:29:22Z")

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Hello all I’m working on a new feature, that would break one use case, so I need to know if, for you or in the workshop you run, this would be an issue… so here goes. At the moment, one can use the same name for a Labe…

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## [Filter out outlier points in a dataset, before fitting kdtree](https://discourse.flucoma.org/t/filter-out-outlier-points-in-a-dataset-before-fitting-kdtree/2813)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 7\
**Last updated:** [June 30, 2026, 10:04am UTC](https://discourse.flucoma.org/t/filter-out-outlier-points-in-a-dataset-before-fitting-kdtree/2813 "2026-06-30T10:04:21Z")

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Hello, In some datasets, when checking for 6 classes on a plotter , I can spot some dots out of their class and isolated. My guess is I should get rid of those. A bit of context: I prototyped a classifier for 6 ways o…

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## [Questions on normalization order in a PCA -\> KDTree pipeline (Audio Matching)](https://discourse.flucoma.org/t/questions-on-normalization-order-in-a-pca-kdtree-pipeline-audio-matching/2799)

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**Author:** [@Lorenz\_Sca](https://discourse.flucoma.org/u/Lorenz_Sca)\
**Replies:** 17\
**Last updated:** [June 24, 2026, 6:29pm UTC](https://discourse.flucoma.org/t/questions-on-normalization-order-in-a-pca-kdtree-pipeline-audio-matching/2799 "2026-06-24T18:29:45Z")

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Hi everyone, I am currently working on a project where I analyze a corpus of environmental recordings using various FluCoMa audio descriptors. Since I am combining different features (MFCCs, Spectral Descriptors, and Lo…

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## [Cheap and cheerful alternative to fluid.grid~ for larger data sets?](https://discourse.flucoma.org/t/cheap-and-cheerful-alternative-to-fluid-grid-for-larger-data-sets/2404)

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**Author:** [@rodrigo.constanzo](https://discourse.flucoma.org/u/rodrigo.constanzo)\
**Replies:** 15\
**Last updated:** [May 24, 2026, 7:56am UTC](https://discourse.flucoma.org/t/cheap-and-cheerful-alternative-to-fluid-grid-for-larger-data-sets/2404 "2026-05-24T07:56:46Z")

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So due to a good breakthrough with fluid.jit.plotter (via some new info/knowledge from the Max beta forum being passed to @balintlaczko) I’ve been resisting 2d plotting of datasets for corpus scrubbing ala CataRT et al. …

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## [Max objects missing?](https://discourse.flucoma.org/t/max-objects-missing/1208)

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**Author:** [@jthompson](https://discourse.flucoma.org/u/jthompson)\
**Replies:** 8\
**Last updated:** [May 5, 2026, 2:02pm UTC](https://discourse.flucoma.org/t/max-objects-missing/1208 "2026-05-05T14:02:25Z")

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I tried running this patch from the thread here: After downloading the FluCoMa objects from: I am still missing the following: newobj: fluid.kdtree~: No such object newobj: fluid.dataset~: No such object newobj: f…

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## [Weighting datasets before UMAP usage](https://discourse.flucoma.org/t/weighting-datasets-before-umap-usage/2782)

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**Author:** [@jacobdesj](https://discourse.flucoma.org/u/jacobdesj)\
**Replies:** 7\
**Last updated:** [May 3, 2026, 5:14pm UTC](https://discourse.flucoma.org/t/weighting-datasets-before-umap-usage/2782 "2026-05-03T17:14:04Z")

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Hey, So I have large datasets (four of different dimensions - 2, 6, 14 and 14) that i merge together in larger fluid.dataset that will be used in umap. I would like to add weight to the different dataset in a way that s…

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## [Guidance building for Bela platform](https://discourse.flucoma.org/t/guidance-building-for-bela-platform/876)

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**Author:** [@muddywires](https://discourse.flucoma.org/u/muddywires)\
**Replies:** 120\
**Last updated:** [April 20, 2026, 3:29pm UTC](https://discourse.flucoma.org/t/guidance-building-for-bela-platform/876 "2026-04-20T15:29:41Z")

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Greetings! I’d love to use some flucoma tools on a bela board and have a few questions about doing so. Has anyone successfully built flucoma-core for Bela platform using the arm flags provided in the core repo? I don’t…

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## [FluidPlotter visualization of the 2D location controlled externally](https://discourse.flucoma.org/t/fluidplotter-visualization-of-the-2d-location-controlled-externally/2774)

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**Author:** [@p3mb](https://discourse.flucoma.org/u/p3mb)\
**Replies:** 9\
**Last updated:** [April 13, 2026, 9:48pm UTC](https://discourse.flucoma.org/t/fluidplotter-visualization-of-the-2d-location-controlled-externally/2774 "2026-04-13T21:48:25Z")

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Hi all, I am trying to control externally the navigation of a 2D corpora in Supercollider. I reckon I can do it passing the parameter to set the point to navigate the FluidKDTree. However, it cannot be visualized. Is th…

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## [Is it possible to use the fluid.bufloader abstration with another folder?](https://discourse.flucoma.org/t/is-it-possible-to-use-the-fluid-bufloader-abstration-with-another-folder/2648)

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**Author:** [@amundsen](https://discourse.flucoma.org/u/amundsen)\
**Replies:** 4\
**Last updated:** [April 13, 2026, 9:44am UTC](https://discourse.flucoma.org/t/is-it-possible-to-use-the-fluid-bufloader-abstration-with-another-folder/2648 "2026-04-13T09:44:44Z")

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Hello, Is it possible to use the fluid.bufloader abstraction with a different folder than the one within the FluCoMa package? Thank you.

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## [Predicting time controlling synthesis parameters - envelopes](https://discourse.flucoma.org/t/predicting-time-controlling-synthesis-parameters-envelopes/2760)

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**Author:** [@Ben](https://discourse.flucoma.org/u/Ben)\
**Replies:** 4\
**Last updated:** [March 2, 2026, 10:22am UTC](https://discourse.flucoma.org/t/predicting-time-controlling-synthesis-parameters-envelopes/2760 "2026-03-02T10:22:54Z")

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Hello! I’m getting into FluCoMa and I’ve been thinking about the - what I now understand to be a difficult problem - of predicting synthesis parameters based on input audio features. What I’m finding hard to conceptuali…

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## [Way of modifying state of "fluid.robustscale" in puredata](https://discourse.flucoma.org/t/way-of-modifying-state-of-fluid-robustscale-in-puredata/2717)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 18\
**Last updated:** [February 9, 2026, 6:17pm UTC](https://discourse.flucoma.org/t/way-of-modifying-state-of-fluid-robustscale-in-puredata/2717 "2026-02-09T18:17:27Z")

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Hello, a bit of an odd question here, I’m adapting some max code from Rodrigo Constanzo in Pure Data which implies at some point the modification of “fluid.robustscale” state: fetch the “Range” in the json file multi…

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## [Building a Max Standalone using Flucoma externals](https://discourse.flucoma.org/t/building-a-max-standalone-using-flucoma-externals/2728)

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**Author:** [@fra.dimaggio](https://discourse.flucoma.org/u/fra.dimaggio)\
**Replies:** 5\
**Last updated:** [January 26, 2026, 9:46pm UTC](https://discourse.flucoma.org/t/building-a-max-standalone-using-flucoma-externals/2728 "2026-01-26T21:46:32Z")

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Hi all, I’m trying to build a Max Standalone using Flucoma externals, such as fluid.mlpclassifier~ and fluid.mlpregressor~. However, even though I create a project and consolidate with all dependences, I get these error…

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## [Modifying point colors when using fluid.dataset~ with fluid.plotter](https://discourse.flucoma.org/t/modifying-point-colors-when-using-fluid-dataset-with-fluid-plotter/2725)

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**Author:** [@Avenir](https://discourse.flucoma.org/u/Avenir)\
**Replies:** 4\
**Last updated:** [January 18, 2026, 10:54pm UTC](https://discourse.flucoma.org/t/modifying-point-colors-when-using-fluid-dataset-with-fluid-plotter/2725 "2026-01-18T22:54:15Z")

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Hi everyone, I’m working on a project that uses fluid.plotter to visualize audio sample analysis through fluid.bufmfcc, fluid.bufstats and fluid.bufflatten. I followed the documentation and managed to: Set the back…

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## [Compare live audio input to existing corpus table coordinate](https://discourse.flucoma.org/t/compare-live-audio-input-to-existing-corpus-table-coordinate/1785)

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**Author:** [@NNenov](https://discourse.flucoma.org/u/NNenov)\
**Replies:** 12\
**Last updated:** [January 18, 2026, 4:15pm UTC](https://discourse.flucoma.org/t/compare-live-audio-input-to-existing-corpus-table-coordinate/1785 "2026-01-18T16:15:54Z")

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Ello, I recently followed the youtube tutorial ( Building a 2D Corpus Explorer ) for setting up a 2D table of classified slices in Max MSP. I was wondering, what kind of approach I would need to take to be able to anal…

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## [Identical slices remove redundancy](https://discourse.flucoma.org/t/identical-slices-remove-redundancy/2704)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 4\
**Last updated:** [December 21, 2025, 10:48am UTC](https://discourse.flucoma.org/t/identical-slices-remove-redundancy/2704 "2025-12-21T10:48:06Z")

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Hello, in some corpora that got huge I would like to remove slices that are too similar , so I reduce redundancy. For example I have 2 clusters well identified, one is 200 points of the same-ish sound the other is 20 po…

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## [Hit zone detection on wooden board](https://discourse.flucoma.org/t/hit-zone-detection-on-wooden-board/2688)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 6\
**Last updated:** [November 22, 2025, 10:39am UTC](https://discourse.flucoma.org/t/hit-zone-detection-on-wooden-board/2688 "2025-11-22T10:39:52Z")

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hello, I’m preparing a work session with a percussionist, who for this project instead of his drumset will use a prepared table & piezo mic . I will use Flucoma’s kdtree classification ( which I explored already in the …

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## [Detecting Fundamental Frequency from Harmonics in Electromagnetic Feedback on Tunable Guitar-Like Instruments (HPS Limitations)](https://discourse.flucoma.org/t/detecting-fundamental-frequency-from-harmonics-in-electromagnetic-feedback-on-tunable-guitar-like-instruments-hps-limitations/2677)

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**Author:** [@GuglielmoDiana](https://discourse.flucoma.org/u/GuglielmoDiana)\
**Replies:** 7\
**Last updated:** [November 20, 2025, 9:07pm UTC](https://discourse.flucoma.org/t/detecting-fundamental-frequency-from-harmonics-in-electromagnetic-feedback-on-tunable-guitar-like-instruments-hps-limitations/2677 "2025-11-20T21:07:01Z")

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Dear FluCoMa community, since this is my first question here, I’d like to say hello and I hope I’m not breaking any rules. I’m PhD at Turin Conservatorium researching on hybrid lutherie and HMI. I’ve read a lot on this…

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## [Offset detection](https://discourse.flucoma.org/t/offset-detection/2613)

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**Author:** [@rodrigo.constanzo](https://discourse.flucoma.org/u/rodrigo.constanzo)\
**Replies:** 4\
**Last updated:** [September 24, 2025, 10:39am UTC](https://discourse.flucoma.org/t/offset-detection/2613 "2025-09-24T10:39:53Z")

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So for a few years now I’ve been using a combination of fluid.ampfeature~ in combination with a gen~ subpatch that is the thresholding component of fluid.ampslice~ as I always wanted the note offsets as well as the onset…

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## [Slicing issue](https://discourse.flucoma.org/t/slicing-issue/2657)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 3\
**Last updated:** [September 23, 2025, 7:20am UTC](https://discourse.flucoma.org/t/slicing-issue/2657 "2025-09-23T07:20:19Z")

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Hi, I need to slice long files, I started by visualizing the “amplitude differential feature” with fluid.bufampfeature, tweaking parameters until The curve look useful: here if I was working with an audio signal an…

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## [Onset detection that focuses on \*pitch\*?](https://discourse.flucoma.org/t/onset-detection-that-focuses-on-pitch/2607)

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**Author:** [@rodrigo.constanzo](https://discourse.flucoma.org/u/rodrigo.constanzo)\
**Replies:** 12\
**Last updated:** [July 9, 2025, 9:04am UTC](https://discourse.flucoma.org/t/onset-detection-that-focuses-on-pitch/2607 "2025-07-09T09:04:04Z")

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So at the moment I’m working on some stuff with a melodica, and I’m having a really hard time with all of the onset detection algorithms (ampslice works, but is erratic, onset isn’t much better, and novelty has a weird i…

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## [Looking inside BufNMFCross](https://discourse.flucoma.org/t/looking-inside-bufnmfcross/2603)

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**Author:** [@tbanados](https://discourse.flucoma.org/u/tbanados)\
**Replies:** 2\
**Last updated:** [June 29, 2025, 9:39am UTC](https://discourse.flucoma.org/t/looking-inside-bufnmfcross/2603 "2025-06-29T09:39:05Z")

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Hi! I’ve been using FluCoMa for a few months and getting some fun results. I am however quite new to a lot of what powers it, learning a bit “on the go”, so I apologise if the question is a bit nonsensical. Basically, h…

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## [Are there ways to speed up bufnmfcross' performance?](https://discourse.flucoma.org/t/are-there-ways-to-speed-up-bufnmfcross-performance/1218)

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**Author:** [@balintlaczko](https://discourse.flucoma.org/u/balintlaczko)\
**Replies:** 34\
**Last updated:** [June 21, 2025, 2:53pm UTC](https://discourse.flucoma.org/t/are-there-ways-to-speed-up-bufnmfcross-performance/1218 "2025-06-21T14:53:16Z")

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Hey there! I am trying to render the creepiest voice-over ever with fluid.bufnmfcross~ in Max. My (mono) target is the voice-over which is 5m27s long. My source is the concatenated buffer of my (mono) short sound gestur…

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## [Creating a feedback minimizer/maximizer](https://discourse.flucoma.org/t/creating-a-feedback-minimizer-maximizer/2585)

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**Author:** [@rodrigo.constanzo](https://discourse.flucoma.org/u/rodrigo.constanzo)\
**Replies:** 6\
**Last updated:** [June 5, 2025, 8:30am UTC](https://discourse.flucoma.org/t/creating-a-feedback-minimizer-maximizer/2585 "2025-06-05T08:30:38Z")

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So off the back of an interesting conversation with @tremblap about getting the most out of a feedback system, specifically ambisonic feedback…: (blog with more info) … I got to thinking about how to go ab…

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## [Pitch confidence slicing / mfcc analysis](https://discourse.flucoma.org/t/pitch-confidence-slicing-mfcc-analysis/2579)

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**Author:** [@yogi](https://discourse.flucoma.org/u/yogi)\
**Replies:** 12\
**Last updated:** [May 23, 2025, 9:28am UTC](https://discourse.flucoma.org/t/pitch-confidence-slicing-mfcc-analysis/2579 "2025-05-23T09:28:06Z")

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Hello, I’ve been experimenting with slicing according to pitch confidence, for later mfcc analysis of the slices, even though the results are already quite usable, I wonder how I should go about improving what I’m doing…

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## [Audiotransport and unbalanced levels](https://discourse.flucoma.org/t/audiotransport-and-unbalanced-levels/2577)

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**Author:** [@amundsen](https://discourse.flucoma.org/u/amundsen)\
**Replies:** 0\
**Last updated:** [May 15, 2025, 9:51am UTC](https://discourse.flucoma.org/t/audiotransport-and-unbalanced-levels/2577 "2025-05-15T09:51:20Z")

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Hello, Whenever one of the two fluid.audiotransport~'s inputs is low, the other tends to become dominant or even take over the output. I would rather expect the output to have a loudness in between those of the two inpu…

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