N(IR)NS

• a convolution reverb / cross-synthesis sound mixer
• traditional reverb effects but also sonic play-doh

resources:

• PartConv | SuperCollider
• convolution_reverb.scd - schollz/supercollisions · GitHub
• here are some impulse response files (make sure to convert to 48khz before using - this makes quick work of the task)
• GitHub - hankyates/norns-convolution-reverb - existing partconv project. Termendously helpful in getting me started. Thank you

pieces:

• SC partconv
• Norns file select / load
  • load (IR) file
• Audio input
• mix control (dry / IR wet)
• later - page to record (IR) - tape call? + save - waveform display

details:

• PartConv.ar(in, fftsize, irbufnum, mul: 1.0, add: 0.0)
  • in - processing target.
  • fftsize - spectral convolution partition size (twice partition size). You must ensure that the blocksize divides the partition size and there are at least two blocks per partition (to allow for amortization).
  • irbufnum - prepared buffer of spectra for each partition of the impulse response.
• Undocumented class methods
  • PartConv.calcBufSize(fftsize, irbuffer)
  • PartConv.calcNumPartitions(fftsize, irbuffer)

to do:

• determine file size limits (24s - way too big, but what is a sensible cutoff?)
  • impulse response can be as large as you like (CPU load increases with IR size. Various tradeoffs based on fftsize choice, due to rarer but larger FFTs. This plug-in uses amortisation to spread processing and avoid spikes).
  • how can i help optimize performance?
• bug have to adjust wet and dry controls after IR file load to hear effect.
• fix volume issue (some IR files are way louder than others)
  • (might need a input volume control pre conv and an output control)
• add more IR files (check out creative convolution thread)
• whats the best way to bundle audio files with scripts??
• buffer number in debug increases every time a new IR is loaded - is that to be expected or a bug?
• ir file pre load processing (normalize, start/end, trim to size - might need to add fade(tail), preview, etc)
• waveform display + related features

archive:

• file select and load to ir buffer/convert to spectrum (48khz files only!)
  • if you load a new IR, you will need to dump previous buffer
• figure out how to clear buffers / spectrums / etc
• -bug- have to load script twice for synthdef / ir's to load. I think this has to do with the ir file/spectrums not being generated as soon as script loads
• working supercollider example
• build most basic version for norns
• add basic controls (wet, dry)