[2.1.4] Stack muting on song change

[musicullum]

try next version, see

Automatic Failover

Next version will feature uninterrupted operation of global channels - mainly relevant for global stacks to continue working during Song changes. Give it a try. ciro uses it so that tracks are connected to the global stacks (thanks a lot to that project, great testcase for us). Here, theory has it that switching may cause a short gap when tracks are dis-and reconnected, but couldn’t even spot one during preload Parts; it can’t get much heavier than that. Used an oscillator in addition to anothe…