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Old 10-21-2013, 12:12 AM
DMIX DMIX is offline
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Join Date: Sep 2013
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Default BOSS DR55 and MPA Rev A

I have added midi to a Boss DR55

the DR55 requires a positive pulse up to trigger

i have wired the MPA RevA trigger outs to the trigger in points of each drum sound.

When i hit "note on" i correctly get a + pulse to the drums

However, "note off" command on note release also gives a pulse, so double triggering happens

How to disable "notes off" on the MPA rev A to stop this?
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Old 10-21-2013, 08:19 PM
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John John is offline
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Originally Posted by DMIX View Post
I have added midi to a Boss DR55

the DR55 requires a positive pulse up to trigger

i have wired the MPA RevA trigger outs to the trigger in points of each drum sound.

When i hit "note on" i correctly get a + pulse to the drums

However, "note off" command on note release also gives a pulse, so double triggering happens

How to disable "notes off" on the MPA rev A to stop this?
Hi DMIX,

Welcome to the forum.

Double triggering has been mentioned before. (When the transition from both low-to-high and high-to-low causes a sound to be triggered.)

http://forum.highlyliquid.com/showthread.php?t=400

Have you tried the MPA's "note toggle" mode? It causes the output to change state for each matching note-on message, while ignoring the note-off. (The output mode description can be found in the firmware documentation.)

If that doesn't work, you'll probably need to find a way to generate fixed-length output pulses. The MPA can't do this, but you could use, say, a 555 timer circuit to convert the MPA output to a fixed duration pulse that is short enough that it will not cause a double trigger.

The MSA has fixed-duration output pulses built-in.

http://forum.highlyliquid.com/forumdisplay.php?f=6
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