A Maths channel self-cycling at audio rate is an oscillator, and feeding another oscillator into its EOC output jack alters its tone differently than into Signal IN

Setting Maths CH.4 to self-cycle at audio frequency turns it into an oscillator you can route to a mixer. The ‘Maths Hack’ observes that applying a separate oscillator’s output to CH.4’s EOC output socket (rather than its Signal IN) produces a different behaviour and tone — the EOC jack, normally an output, becomes an unconventional injection point that perturbs the cycle at its trigger boundary rather than frequency-modulating the core. Adding a second oscillator to the Signal IN at the same time yields complex two-oscillator interactions to explore by tuning both.

Examples

CH.4: CYCLE on, RISE+FALL at audio rate, output to mixer. External OSC → CH.4 EOC output socket (not Signal IN). Then also patch a second self-cycling CH.1 → CH.4 Signal IN. Detune the two oscillators.

Assessment

What tonal difference would you expect between patching an external oscillator to CH.4 Signal IN versus its EOC output socket?