Master::initMutex is used when we expect longer timeouts during Instruments loading or bankswitching.
jackprocess() uses pthread_mutex_trylock() on it and
outputs silence, if initMutex isn't available
Master::processMutex is used to protect note/parameter events from actual soundgeneration.
jackprocess() unconditionally requests it, so there are far less crackles.
Patch is against cvs head of yesterday.
It contains a Makefile.inc change switching zyn to jackd + alsa - midi mode.
jackd-midi is commented out as it didn't compile here.
PADnoteParameters::applyparameters()'s "bool lockmutex" argument is deleted as its always called with true.