Add Mute & Solo to MIDI chains in the Mixer view

[wyleu]

Is your feature request related to a problem? Please describe.
In complicated snapshots made of multiple MIDI chain instances you will frequently wish to check control paths throu the system.
The ability to easily MUTE or SOLO individual MIDI channels woul be of great benefit in this regard.

Describe the solution you'd like
SOLO & MUTE buttons enabled for MIDI chains.

Describe alternatives you've considered
Much menu strolling.

[riban-bw]

I like the idea of adding a mixer strip to the mixer view that offers some control over MIDI devices. It has been discussed in the forum a little. It needs some consideration because MIDI chains have a variable quantity of MIDI inputs and outputs.

• Would solo interact with audio chains, e.g. pressing solo on a MIDI chain should/not mute audio chains?
• How would MIDI+Audio chains behave?
• Would mute stop MIDI from leaving the associated zynmidirouter chX_out? (This makes most sense I think.)
• Would solo stop MIDI from leaving all other chX_out? What about other MIDI outputs?
• Should we add a fader that does/can send MIDI CC 7?
• Should we add a pan/balance that does/can send MIDI CC 8 or 10?
• Should we add a record arm parameter so that MIDI recorder can record multitrack?

Some of this may be simpler to implement in a similar way to how the zynmixer is being enhanced, by adding a MIDI processor with these options. If so, would we want to offer this as an option or always add the MIDI processor (similar to zynmixer for audio)?