StepPy: a step sequencer in Python

Using this project, one can:

Abstractions allow programmers to customize the behaviour for a particular controller.

Bindings are already available for:

Genesis

This project was demonstrated @ Pycon-Fr 2016.

The slides are available here <https://speakerdeck.com/ygravrand/build-a-step-sequencer-using-python-fosdem-17>_ (soon on this repository).

First demo:

.. image:: http://img.youtube.com/vi/j3N0pPi5eu4/0.jpg :width: 320px :height: 240px :alt: "First StepPy demo" :align: center :target: https://youtu.be/j3N0pPi5eu4

To install the package and run StepPy:

Install python, virtualenv and make sure you have a C compiler, portmidi and python headers: e.g. sudo apt-get install -y git python3 python3-virtualenv libpython3-dev libportmidi-dev build-essential on Debian/Ubuntu
Clone this repository and cd into it
Create a virtualenv: virtualenv --python=python3 .venv; source .venv/bin/activate
Run pip install -e . or python setup.py develop
Connect a supported controller on an USB port
Run python -m steppy.main or python -m steppy.main load examples/mozart.json

To run tests:

StepPy ships with an integrated gevent-based web server with real time updates via Websockets.

To use this server (only works with python 2 for now):

Install redis and python2 along with other dependencies: e.g. sudo apt-get install -y git python virtualenv libpython-dev libportmidi-dev build-essential redis-server
Clone this repository: git clone https://github.com/ygravrand/steppy; cd steppy
Create a virtualenv: virtualenv .venv2; source .venv2/bin/activate
Run pip install -e .
Connect a supported controller on an USB port
Launch redis if not already launched: redis-server --bind 127.0.0.1 --daemonize yes
Run python -m steppy.main -s or python -m steppy.main -s load examples/mozart.json

Run python -m steppy.main list, this will list the detected inputs and outputs
Edit conf/steppy.conf and add the corresponding names to a port_name parameter.

For example::

[[launchcontrol1]] type = launchcontrol port_name = Launch Control MIDI 1
On Mac OS X, problems have been reported with system upgrades, resulting in errors like this one <https://github.com/olemb/mido/issues/44>_. A solution could be to modify <venv>/lib/python2.7/site-packages/mido/backends/portmidi_init.py to specify the absolute location of the library::

if sys.platform == 'darwin': dll_name = ctypes.util.find_library('/usr/local/lib/libportmidi.dylib')

See this discussion <http://stackoverflow.com/questions/32905322/oserror-dlopenlibsystem-dylib-6-image-not-found>_ for details.