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"SOLVED" Problems with MIDI CC Duplicates

ld57ld57
edited September 2025 in Loopy Pro

Here’s the problem I’m having with MIDI CC.

Let’s imagine I have a MIDI source that’s sent to 2 MIDI tracks:

  1. On one MIDI track, I have an instance of Mozaic that transforms MIDI CC1 into CC2.
  2. The second MIDI track is a looper.

The problem: If my controller sends a MIDI CC1

  • It comes out of the first track transformed into MIDI CC2
  • And it comes out of the looper as MIDI CC1
  • Both MIDI CC messages reach my synth, and that causes problems.

What I’d need is the option in LoopyPro to block MIDI CC on the looper and only let notes pass through.
The issue becomes clear when modifying CC on another track, because otherwise the MIDI CCs are just sent in duplicates to the instruments (which could also be another source of problems).

Comments

  • wimwim
    edited September 2025

    Upvote and add comments here if this doesn't cover everything you need:
    https://roadmap.loopypro.com/feature-requests/p/add-midi-filters-eg-quantize-to-set-key-filtering-modpitch-wheel-etc

  • wimwim

    There are ready made Mozaic scripts that you could use or modify to filter the CC messages. If you need help with such a script it's readily available here.

  • ld57ld57

    Yes I use Mozaic to modify the CC messages, and that why I found this bug.

    I don't think there is a way to remove CC messages on a MIDI loop track? (after the loop, like a pre/post-fader effect)

  • espiegel123espiegel123

    @ld57 said:
    Here’s the problem I’m having with MIDI CC.

    Let’s imagine I have a MIDI source that’s sent to 2 MIDI tracks:

    1. On one MIDI track, I have an instance of Mozaic that transforms MIDI CC1 into CC2.
    2. The second MIDI track is a looper.

    The problem: If my controller sends a MIDI CC1

    • It comes out of the first track transformed into MIDI CC2
    • And it comes out of the looper as MIDI CC1
    • Both MIDI CC messages reach my synth, and that causes problems.

    What I’d need is the option in LoopyPro to block MIDI CC on the looper and only let notes pass through.
    The issue becomes clear when modifying CC on another track, because otherwise the MIDI CCs are just sent in duplicates to the instruments (which could also be another source of problems).

    I am not 100% understanding. It isn't clear that what you are describing is a bug.

    Can you post screenshots showing the MIDI routing and diagram what is going on.

  • wimwim

    Yes, the routing is important here. Reading your description it almost sounds as though you’re parallel routing to Mozaic and the synth. Normally I’d expect all the midi to go through Mozaic.

  • ld57ld57
    edited September 2025

    @wim said:
    Yes, the routing is important here. Reading your description it almost sounds as though you’re parallel routing to Mozaic and the synth. Normally I’d expect all the midi to go through Mozaic.

    Yes parallel routing! My MIDI keyboard goes to the Blue looper, and Mozaic.

    • Mozaic modifies the MIDI CC1 to CC2
    • But the same Midi CC1 also goes through the looper
      So in the end I get duplicates CC: CC1 and CC2. I need to find a way to block CC messages on the looper

    screenshot

  • espiegel123espiegel123

    @ld57 said:

    @wim said:
    Yes, the routing is important here. Reading your description it almost sounds as though you’re parallel routing to Mozaic and the synth. Normally I’d expect all the midi to go through Mozaic.

    Yes parallel routing! My MIDI keyboard goes to the Blue looper, and Mozaic.

    • Mozaic modifies the MIDI CC1 to CC2
    • But the same Midi CC1 also goes through the looper
      So in the end I get duplicates CC: CC1 and CC2. I need to find a way to block CC messages on the looper

    screenshot

    I don’t see a bug here. You are recoding unfiltered midi and sending it back out. You can put a midi filter between the Launchkey and Blue to prevent recording or between blue and the destination to record the cc but prevent transmission.

  • ld57ld57

    @espiegel123 said:
    I don’t see a bug here. You are recoding unfiltered midi and sending it back out. You can put a midi filter between the Launchkey and Blue to prevent recording or between blue and the destination to record the cc but prevent transmission.

    How do you put a Mozaic midi filter between Launchkey and Blue?

  • espiegel123espiegel123

    @ld57 said:

    @espiegel123 said:
    I don’t see a bug here. You are recoding unfiltered midi and sending it back out. You can put a midi filter between the Launchkey and Blue to prevent recording or between blue and the destination to record the cc but prevent transmission.

    How do you put a Mozaic midi filter between Launchkey and Blue?

    https://wiki.loopypro.com/MIDI_Essential_Tips_and_Tricks

  • ld57ld57

    @espiegel123 said:

    Many thanks! I did not notice that one Midi track could send to both my synth and the blue looper. So now my blue looper has only the Mozaic track as source and no more duplicate CCs :smiley:

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