Now that REAPER's multi-channel CC display bugs
have been improved (but not yet completely solved), users will venture to use the CC drawing and editing mouse modifiers in such multi-channel situations. In particular, users will often need to draw CC curves in multiple channels in overlapping time ranges.
Unfortunately, there appear to be many bugs and inconsistencies when drawing CC events in more than one channel on the same PPQ position. It is difficult to describe everything in words, so here are GIFs instead:
Draw/edit CC events ignoring selection
At the left edge of the item, something strange is going on. At the other positions it seems that, when inserting a new
CC in channel X at a position where there is already CCs in other channels (the default channel for new events is set to X), a new CC is inserted in channel X, but one of the other CCs is also edited to the same value. The mouse modifier therefore affects CCs in two channels, inserting a CC as well as editing another.
Edit CC events
Both channel are edited when the mouse moves over the CC, but only the active channel is edited when the mouse moves in the grid space.
Move CC event on one axis only
Somehow the leftmost CC in channel 1 becomes selected and then
I suggest that the devs should play around with all the mouse modifiers in multi-channel situations. The bugs will quickly crawl out of hiding, and I expect that there are more bugs than what I listed here.
In general, I suggest that all CC editing actions should affect only
the active channel.
Alternatively, a more fancy solution would be to let the channel dropdown menu determine the effect (as also proposed in the thread Multi-channel CCs disappear and/or display with incorrect channel color
* If the menu is set to "All channels", the editing actions affect all channels simultaneously (and no new CCs are inserted by the Draw/edit action if there are already CCs in any channel at the PPQ position).
* If the menu is set to a specific active channel, the editing functions affect only
that active channel.