implement synchronization with endorphines

[robertoostenveld]

see issue #197 and the valuable documentation there

[stephenwhitmarsh]

Using the clock signal works wonderfully with the Endorphines Shuttle Control. However, it needs a MIDI start message to start. This is similar to the Doepfer Dark Time, but there I could just press the start button. For now, I just added in line 214 of generateclock.py (not committed):

        # MIDI start message
        msg = mido.Message('start')
        midiport.send(msg)

There are several non-exclusive options for a better implementation:

1. define (launchcontrol) event/pushbutton for MIDI-start and one for MIDI-stop. Could also be implemented in the outputmidi module
2. MIDI-start at start of module, MIDI-stop at closing (keyboard interrupt)

Suggestion: Add a start and stop value in the [midi] field. If boolean just start/stop automatically, else respond to redis pubsub event. Also add to outputmidi.

[robertoostenveld]

I think that the current "enable" option in the ini should be renamed to "play" (for consistency with other EEGsynth modules). When connected to a launchcontrol button (=midi note), it should not only enable the thread but also send the start message. Idem for stop.

[robertoostenveld]

e.g.

[midi]
device=xxx
ppqn=24
play=launchcontrol.note021  ; instead of the general "midi" item

upon play it sends "start", when play goes to 0 it sends "stop"

[stephenwhitmarsh]

If I remember corrected, this is now implemented, right?

[robertoostenveld]

this does not seem to be implemented, it is not in endorphines.py