Patch of the Day - Ping

Live patch featuring a modified Doepfer A-162 Trigger Delay to ping filters, including a Cwejman MMF-1, RES-4 and a Metasonix R-54.





I love the sound of a pinged filter and normally use Maths' EOA to convert a gate signal into the short pulse necessary to achieve this. Having only one Maths in my system, this can be an 'expensive' use of the module, so I wondered whether the A-162 could be a cheap alternative.

At 10V, the A-162's output is hot enough to push a filter into oscillation. Unfortunately, the stock module's minimum time is only just short enough to avoid a double-trigger. I first replaced the standard 10 uF timing capacitor with a 1 uF, but, despite shortening the range by a factor of 10, it didn't give the scope I wanted, so I settled on a 0.1 uF blocking cap!

At the beginning of the recording, you can hear the effect the pulse width has on the MMF-1's ring as I increase the length up to the point where it double-triggers and back. With a 0.1 uF cap, the pulse is so short it can also be used to FM the filter to add a percussive edge.

If you want to try this mod on your Trigger Delay, or other Doepfer module with a timing capacitor, there's more info here.

See an update to this post here.