Why does modulation wheel/expression pedal data from my Impulse come into Ableton Live on channel 3?

Applies to: Impulse 25, 49 and 61

When you have the Impulse set as a Control Surface in Ableton Live, you will find that data from moving the modulation wheel or expression pedal comes in on a different channel to the rest of the controls of Impulse.

This is because the Ableton Live script for the Impulse will filter out these messages when they're on channel 1 or 2 as it believes it to be controller data. Therefore, we implemented a workaround in the Impulse firmware which sends the data on a separate channel (channel 3) when the Impulse detects it is set as a Control Surface in Ableton Live.

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