Recording MIDI noteouts as audio within the same patch..?

Feb 4, 2011 at 10:12am

Recording MIDI noteouts as audio within the same patch..?

Hi, I’m a relative Max/MSP newb, and am trying to do the above; i.e. record the MIDI sounds created in a patch (using the built-in Mac DLS synth) as audio (using an ezdac) within the patch in order to process the sound further…

I know MIDI is streams of numbers, but the sounds they represent exist – I can hear ‘em! I’ve tried using Soundflower but it seems to want to talk between different applications, not the same one. I have no MIDI hardware – just the computer…

Thanks for any helpful direction :)

Feb 4, 2011 at 10:18am

…er, I mean using an ezadc, ahem…

Feb 4, 2011 at 11:06am

one possible way:
look at for fluidsynth~
this gives you midi and audio within the patch.

using soundflower:
you have to set system audio out to soundflower: this is done in applications/utilities/audio-midi-setup.
then you can reroute the audio into max/msp

all this assuming you are on mac…


Feb 4, 2011 at 11:38am

You can use the DLS synth as AU plugin (works well for me).

Thus audio output will be directly available in your patch.

Just create an object [audiounit~ DLSMusicDevice]

MIDI input must be in special format, ie. raw midi bytes prepended with ‘midievent’.
For example, is note on channel 1, pitch 60 and velocity 80.

Feb 4, 2011 at 12:23pm

Thanks for your responses!

Kochhw; I’m on a Mac, and embarrassingly both Soundflower and the fluidsynth object aren’t making sense to me in terms of this problem… Broc, the audiounit object is, however, so I think I see a way forward.

Your swift and interested responses are very much appreciated sirs.

Feb 4, 2011 at 12:33pm

One thing: what’s the significance of the 144 in the midievent message?

Feb 4, 2011 at 1:29pm

144 is the midi byte code for note on channel 1, 145 would be note on channel 2 etc.

Here is an abstraction I’m using to generate the required format.

– Pasted Max Patch, click to expand. –
Feb 4, 2011 at 1:57pm

Thanks – are the different channels to do with being able to have different simultaneous (as in pgmchange for the DLS synth) voices?

I’m afraid I don’t know what your CC and PC inputs are: below is the simple way I’m generating audio from MIDI thus far (I stress the word ‘simple’!)

– Pasted Max Patch, click to expand. –
Feb 4, 2011 at 3:08pm

Yes, the channels can be used to play different voices (instruments) at the same time.
Hence the DLS synth is also called a “multi-timbral instrument”.

CC = Control Change
PC = Program Change

Feb 4, 2011 at 6:46pm

Thanks very much.


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