It's certainly possible -- in fact, dead easy -- to start notes in Csound in
response to MIDI note-on messages. In fact, it's hard to prevent. I have no
trouble doing this in CsoundQt, using a very simple test file. You don't
need turnon and turnoff, just create an instrument numbered 1 and then play
the keyboard.

The real situation in Csound, as I learned this week, is even simpler than
this, yet more confusing. If you've defined only a single instrument, it
doesn't matter what number you give it. It will respond in MIDI omni mode no
matter what channel the note messages are received on. To assign different
instruments to different MIDI channels, use massign in the global
instruments area. If you want more details on this, let me know.

However, at the moment I'm not having any luck making it work (in Windows)
using blue. In the Options box, I've set both the Realtime Render Devices
field to use my MIDI keyboard, and also activated it in the MIDI tab. (I
don't know why there are two places to do this.) But a similar test file
yields no audio output in response to MIDI notes from my keyboard.

Steven will have to weigh in on this topic. But he'll want to know, Trev:
Which OS are you running? And which version of blue?



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Sorry -- I thought your message was in the blue sub-forum. My bad.

The basic question remains: What OS are you using? Are you using a front
end, or running Csound from the command line? Or perhaps using the Csound
API object inside of Max?



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hi trev -

do you mean via the csound~ object in maxmsp? then it is simply sending 
an "event i" message (described in the csound~ help).

	joachim


Am 15.12.2012 06:54, schrieb William Wignall:
> Dear List-
>
> I'd like to know if it's possible to dynamically turn instruments on and
> off with MIDI or a string (from MaxMSP for instance). I suppose this
> would be using the turnon/off opcodes? There's really nothing about this
> in the manual however... Can anyone shed any light on this?
>
> Thanks,
> Trev