A large mul or an unattenuated feedback bus in Glicol clips loudly with no error

Glicol applies no automatic level protection: a large mul factor or a feedback bus without attenuation drives the output into clipping — very loud, with no error printed. The discipline is to end an audible chain with a gentle final level (>> mul 0.2 or similar) and to attenuate any self-referential feedback path so its round-trip gain stays below 1. Because there is no master limiter, keeping levels in check is manual.

Examples

A ~fb echo bus fed back at >> mul 1.1 grows unbounded. Fix: >> mul 0.6, and end out: with >> mul 0.2.

Assessment

Explain why a Glicol feedback bus can clip without any error, and state the two level-discipline habits that prevent it.