OP Patch Utility

A command line tool for creating and modifying patches for the OP-1 and OP-Z.

Installation

E.g. installing the OSX build to /usr/local/bin:

curl -Ls https://github.com/AlexCharlton/op-patch-util/releases/latest/download/op-patch-util-1.0.0-osx.tar.gz | sudo tar -zx -C /usr/local/bin

Installing with the Rust toolchain

$ git clone https://github.com/AlexCharlton/op-patch-util.git
$ cargo install --path ./op-patch-util

Usage

USAGE:
    op-patch-util [FLAGS] [SUBCOMMAND]

FLAGS:
    -h, --help       Prints help information
    -q               Silence all output.
    -V, --version    Prints version information
    -v               Increase message verbosity.

SUBCOMMANDS:
    copy       Copy samples from one set of keys to another
    drum       Create a drum patch from up to 24 WAV files
    dump       Output the OP metadata associated with a patch
    forward    Set sample to play forward
    help       Prints this message or the help of the given subcommand(s)
    pitch      Shift the pitch of a given key
    reverse    Set sample to play in reverse
    set        Overwrite the OP metadata with a given JSON file
    shift      Shift the samples up or down by N keys
    silence    Turn sample gain to -inf
    synth      Create a synth sampler from a WAV file
    volume     Set sample gain to a value between -1.0 (-inf) and +1.0 (+12 dB)

Examples

Creating a 12 key patch

Given a directory samples with 12 samples from C-B:

$ op-patch-util drum samples/*.wav -s7 -p

This will create a new drum patch using the input samples. The samples are shifted over by 7 keys (-s7) to align with the C key, then the first and last samples are pitched to fill in the remaining keys (-p).

Adjusting the gain on a patch

$ op-patch-util volume --keys 1-12 --gain 0.5 input.aif

This will create a new output.aif with +3 dB more gain (1.0 is +6 dB) than the input on the first octave --keys 1-12.

Editing metadata using jq

If you need to edit metadata that isn't directly supported by op-patch-util, you can use the excellent jq:

$ op-patch-util dump input.aif - | jq '.octave = 1' > new.json
$ op-patch-util set  -j new.json input.aif

This creates a new output.aif with an octave value of 1.

Creating multiple patches at once

Unix-like environments (including OS X)

Create a file called multi-patch-builder.sh with the following contents and run chmod 775 multi-patch-builder.sh:

#!/bin/bash

CURRENT_DIR=$(pwd -P)

for dir in "$@"
do
    cd $CURRENT_DIR/$dir
    op-patch-util drum *.wav -o $CURRENT_DIR/${dir}-patch.aif
done

Alter the op-patch-util command in any way you desire

Then, given two directories with WAV files - samples1 and samples2- you can run this script like so:

$ ./multi-patch-builder.sh samples1 samples2

And you will get two output drum patches, samples1-patch.aif and samples2-patch.aif.

Contributing

If you think the op-patch-util should do something it doesn't, or if you've found a bug, please file a Github issue.

Pull requests are welcome.

Changelog

1.1.0

• Add drum --low-res option to allow for double the total sample length at the expense of halving the bitrate.