MIDI errors for deck 3/4 when launching with Shade (2 decks)

[ronso0]

a MIDI error message is displayed when starting Mixxx with Shade and a controller attached that has a 4-deck MIDI mappping with LED output functions for decks 3/4, also the log is continously spammed with those messages.

Solution might be to read [Master],num_decks and deactivate output mappings for decks 3/4 if they're unavailable in the GUI.

A rare use case on the other hand:
A 2-deck skin shouldn't hinder that I use decks 3/4 as parking slots for tracks I come across that I want to store for later on. When I need them I simply pull them to main decks 1/2 with MIDI clone controls, and I actually don't need them in the GUI until then.
For that case decks 3/4 should be blocked for 'helpful' GUI & MIDI/HID controls like "load track to next free/stopped deck", but explicitely loading tracks to invisible decks should remain possible.

affected mappings:
* Reloop TerminalMix 2/4
* ?

[Daniel Schürmann (daschuer)]

I am unsure here. Can't you just use a four deck skin in this case?
I guess a majority of users do not even have a controller attached, so it would be confusing for them to have access to invisible decks.

I can confirm this bug, because we should find a way to remove the log spam.

[ronso0 (ronso0)]

yes, the use case of a 4-deck controller with a 2-deck skin can be ignored.

The log spam is avoided if the script reads [Master],num_decks on init and uses this variable for the timed LED flash functions (loop indicator, play_from_cue indicator, ...)

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/9738