The ASM302 is a small general purpose envelope shaper offering AD and ASR envelopes as well as an LFO mode.

In ASR mode the envelope output rises when the [GATE' goes high and will remain at its maximum output until the [GATE] goes low at which point the envelope output goes through the decay phase.

In AD mode the ASM302 is ‘self completing’ and the envelope output goes through the complete attack and decay phases (as long as the [GATE] ON time is equal to or greater than the RISE/FALL period).

The ASM302 can also be used as an LFO. If JP102 has been fitted then with no [GATE] connection (i.e. no patch cord connected) the LFO will continuously free run at a frequency dictated by the settings of the [RISE] and [FALL] controls. When a [GATE] connection is made the 'free-run' function is disabled and the LFO becomes gated and will only oscillate when the GATE signal is high.

CAVEAT: When 'ASR' mode is selected and there no GATE connection, the envelope OUT will sit high. Users should deselect 'ASR' mode to return the envelope OUT to low. If JP102 is not fitted, the LFO mode will only operate when the [GATE] is on.

The [RISE] and [FALL] profiles are both logarithmic.

The ASM302 has a maximum output frequency of around 250Hz ([RISE] and [FALL] at their minimum positions) while at the maximum settings for [RISE] and [FALL] the rise and fall times are each of the order of 15 seconds.

Build Guide