This problem is weird - the musician experienced weird native tracker and plugin hard crashes when editing stacks. I boiled the instrument down to this minimal example:
name: rp-Berlin
numvoices: 7
units:
- type: oscillator
id: 2
parameters: {attack: 64, color: 42, decay: 64, detune: 74, gain: 128, looplength: 563, loopstart: 5448, phase: 0, release: 64, samplestart: 143113, shape: 82, stereo: 1, sustain: 64, transpose: 69, type: 4, unison: 1}
- type: out
id: 11
parameters: {auxgain: 64, color: 64, damp: 0, detune: 64, dry: 128, feedback: 96, gain: 64, notetracking: 2, outgain: 64, phase: 0, pregain: 40, shape: 64, stereo: 1, transpose: 64, type: 0}
When disabling or deleting either of the units, the native tracker (and plugin) hard-crash. I collected debug output as well:
sointu_crashlog2.log