SuperCollider gain and feedback runaway throws no error — only rising volume, clipping, or DC blowup signals it

Several SuperCollider configurations produce volume runaway or DC blowup silently, with no error thrown: a high-Q RLPF (small rq value), a long CombN decay, LocalIn/LocalOut feedback with gain >= 1, or many summed voices. Because nothing is posted, the only signal is the sound itself. Prevention: keep per-voice levels at 0.1–0.3, put Limiter.ar on the master output, keep any feedback gain strictly below 1, and use LeakDC on DC-heavy graphs. CmdPeriod or s.freeAll is the emergency stop.

Examples

RLPF.ar(sig, 800, 0.001) can resonate to extreme levels. CombN.ar(sig, 2.0, 2.0, 100) never decays.

Assessment

State why SuperCollider gain runaway is easy to miss, and name the master output safeguard that limits clipping.