I am fairly new to PD and I'm creating a monophonic synthesizer to be controlled by MIDI keyboard.
MIDI in is not a problem and I've set 'note on' messages to trigger an ADSR which envelopes the output from my bank of oscillators.
The real problem is that it doesn't behave as a mono synth should because it has no memory of which notes are being held. E.g. If I play a C and hold it down then play a D and release it, the synth should go back to playing the C. But in my setup, the audio just stops because there is no trigger to the ADSR.
How have people got round this problem before and does anyone have a simple patch that can demonstrate 'correct' mono synth behaviour?
Any help appreciated,
Al
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strangely enough, I've just written a patch that does JUST that. It is a copy of a roland SH-101, it's only got about a third of all the features, but it DOES have the monosynth behaviour implemented.
I don't know how most mono synths play, but I copied the behaviour from the SH-101, that means if you take your finger off the lowest note held, then the NEXT lowest one held is the sound then heard. thus lower notes always take priority. you get the quick portamento effect by holding a high note and alternately pressing and releasing a low key (releasing the high note either does nothing or cuts all sound if no other notes held). does this make sense? anyway, this is the behaviour I copied; it has a list of the 6 lowest notes currently held down.
I can bring in this patch tomorrow if required, I don't have it here at work.
matt
-=-=-=-=-=-=-=-=-=-=-=-=- http://www.loopit.org/ -=-=-=-=-=-=-=-=-=-=-=-=- ----- Original Message ----- From: "Al Riley" alrileyuk@yahoo.co.uk To: pd-list@iem.at Sent: Monday, February 16, 2004 12:03 PM Subject: [PD] Mono synth behaviour
I am fairly new to PD and I'm creating a monophonic synthesizer to be controlled by MIDI keyboard.
MIDI in is not a problem and I've set 'note on' messages to trigger an ADSR which envelopes the output from my bank of oscillators.
The real problem is that it doesn't behave as a mono synth should because it has no memory of which notes are being held. E.g. If I play a C and hold it down then play a D and release it, the synth should go back to playing the C. But in my setup, the audio just stops because there is no trigger to the ADSR.
How have people got round this problem before and does anyone have a simple patch that can demonstrate 'correct' mono synth behaviour?
Any help appreciated,
Al
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matthew jones wrote:
I don't know how most mono synths play, but I copied the behaviour from the SH-101, that means if you take your finger off the lowest note held, then the NEXT lowest one held is the sound then heard. thus lower notes always take priority.
It varies. Some synths play the highest note, others the lowest. You'll need to add a switch for total emulation ;)
Martin
See doc/3.audio.examples/C10.mono.synth.pd in the Pd distribution for an example.
cheers Miller
On Mon, Feb 16, 2004 at 12:03:53PM +0000, Al Riley wrote:
I am fairly new to PD and I'm creating a monophonic synthesizer to be controlled by MIDI keyboard.
MIDI in is not a problem and I've set 'note on' messages to trigger an ADSR which envelopes the output from my bank of oscillators.
The real problem is that it doesn't behave as a mono synth should because it has no memory of which notes are being held. E.g. If I play a C and hold it down then play a D and release it, the synth should go back to playing the C. But in my setup, the audio just stops because there is no trigger to the ADSR.
How have people got round this problem before and does anyone have a simple patch that can demonstrate 'correct' mono synth behaviour?
Any help appreciated,
Al
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