This software is for uncompressed 16-bit PCM WAV files as used in the Akai MPC 1000. Originally, it was for creating loop points for one-note samples of synths and other sounds for use in JJOS2XL "INST" programs. These programs allow the MPC 1000 to be played with a MIDI keyboard as if it was a synth.
Several other subcommands have been added to provide other functionality.
USAGE: LoopMyWav [--help] [<subcommand> [<options>]]
SUBCOMMANDS:
granular <options> Play grains from input files
walker-demo <options> Show values from random walkers
jsonwav <options> Show JSON for WAV file internals
decwav <options> Show decimal in CSV for WAV samples
loopswav <options> Read input WAV file names to be looped from lines in
file
noise <options> Add noise to WAV file according to JSON configuration
Use 'LoopMyWav <subcommand> --help' for additional information.
OPTIONS:
--help display this list of options.
Currently deployment is limited only to Linux, because the cross-platform GUI support of Eto.Forms is not used.
This is "best effort" software
that doesn't mind using assert
instead of more elaborate error handling.
I want to write it and use it in music production ASAP,
so I'm going fast.
Usage documentation in the subcommand sections below
can be translated to commands run in this repository
by typing dotnet run -- instead of LoopMyWav.
The loop points allow the notes to be sustained indefinitely, and many sample packs are created in a way that allows such loops to be created. However, the loop points often must be set manually.
The loopswav subcommand automates the insertion
of forward loops at "good" loop points
for every input file found in the WAVSFILE.
For best results, loop short audio samples, a few seconds long, with enough variation to be interesting but enough consistency or periodicity for looping to sound good.
USAGE: LoopMyWav loopswav [--help] [<WAVSFILE>]
LOOPWAVSFILE:
<WAVSFILE> Text file with input WAV file name per line
OPTIONS:
--help display this list of options.
Most granular synthesizers use only mono samples or ignore the distinction between the left and right channels.
LoopMyWav in granular mode preserves multi-channel audio, using multi-channel grains.
If you supply more than one audio file, LoopMyWav will use a slewed Dirichlet process to mix the granulated tracks.
The noise function from the subcommand described below can be used on the granulated audio by specifying a JSON config file.
USAGE: LoopMyWav granular [--help] [--n-grains <nGrains>]
[--n-seconds <nSeconds>]
[--noise-config <noiseConfig>]
--out-wavfile <outWavFileName>
--in-wavfiles [<inWavFileName>...]
OPTIONS:
--n-grains <nGrains> Number of grains to use
--n-seconds <nSeconds>
Number of seconds for output WAV
--noise-config <noiseConfig>
JSON configuring noise to be added
--out-wavfile <outWavFileName>
The name of the WAV file to create for output
--in-wavfiles [<inWavFileName>...]
The sources from which to draw grains
--help display this list of options.
The noise generator described below uses randomized accelerations
to modulate speeds that modulate lengths
of delay lines.
To make that more concrete, you can use this demo
to print data for viewing in ggplot2 in R
or something worse. (Just kidding.)
USAGE: LoopMyWav walker-demo [--help] [--n-steps <nSteps>]
OPTIONS:
--n-steps <nSteps> Number of walker steps
--help display this list of options.
This subcommand parses the input WAV file and prints JSON for its innards.
USAGE: LoopMyWav jsonwav [--help] [<WAVFILE>]
JSONWAVFILE:
<WAVFILE> WAV file for JSON display
OPTIONS:
--help display this list of options.
This subcommand prints the WAV files samples as CSV.
USAGE: LoopMyWav decwav [--help] [<WAVFILE>]
DECWAVFILE:
<WAVFILE> WAV file for CSV decimal sample display
OPTIONS:
--help display this list of options.
This subcommand causes LoopMyWav to add noise to the input WAV audio as configured by a JSON file. A random walker modulates delay lines that are mixed with the original audio.
An optional GUI allows you to act as the objective function
for Bayesian optimization over the
random walker's parameters.
Use the --optimize option to find walker parameters you like
for your JSON config file.
An example config file appears here as config.json.
TODO:
-
Add logging of parameters and associated losses
-
Support loading of pre-recorded parameters and losses
USAGE: LoopMyWav noise [--help] [--noiseinputwav ] [--jsonconfigfile ] [--optimize]
OPTIONS:
--noiseinputwav <WAVFILE> Input WAV file to be noisified --jsonconfigfile <JSONFILE> Configuration JSON file --optimize Use a GUI to participate in Bayesian optimization --help display this list of options.
This software requires the .NET Core 5 SDK and was tested on Linux. Required libraries are installed when the software is run in place using the usage patterns above.
Audio playback in the noise generator
requires mpv,
an audio player.
To use JACK, add --ao=jack
to the mpv command arguments in Program.fs.
The jq tool is nice for JSON output
but is not required.