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How do I transpose incoming midi notes sent thru MDP2 from a midi keyboard? - MIDI Designer Q&A

How do I transpose incoming midi notes sent thru MDP2 from a midi keyboard?

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asked Nov 29, 2021 in Advanced by tjspurge (170 points)

1 Answer

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The stand alone StreamByter app should do what you want.  You are wanting to operate on a MIDI stream - MDP2 focuses on either input or output.

You could to it in MPD2 in a brute force way - but you would need two controls for each individual note - one to receive and one to transmit.  Then a supercontrol to set the transpose amount.

Here is a SB post discussing real time transposition by a variable amount, set by a CC.  One of the important considerations is transposing the note off events the same as note on to preclude stuck notes.

If you search on the Audeonic soapbox for transpose, there are a few more examples, such as using program change to control the transpose.

MDP2 might still have a role in this by providing the UI to control the transpose in SB.


EDIT -- the SB examples are all somewhat complicated.  I will try to post a "simple" SB code fragment that just does a preset transpose - hopefully in the next day or so.

Edit 2 - turns out the stand alone SB has the transpose function built in.  A few comments that might help you - the three values in the if load determine which channel to transpose, and which cc will control transposition.  As distributed, this is 00 B0 13, or Chanel 0, B (which is the value for CCs, don’t change), and 13 for the cc value (in decimal = 19).

To use MDP2 to control the transposition, you need a single knob control, CC, channel 00, cc19.  Default value 64 = no transpose,  Higher values transpose up, lower values transpose down.
answered Dec 1, 2021 by jkhiser (18,640 points)
edited Dec 1, 2021 by jkhiser
wow thank you for the detailed answer! much appreciated, i’m going to try these out