Wednesday, 16 February 2011

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.

7 comments:

Gilaad said...

Yes, it's you and your POD's that makes me buy all this stuff! breathtaking as always....

Cheers
gb

james said...

awesome. can you give a rundown of which filter is which? what's the one which makes a nice low tom sound?

Navs said...

Thanks, Gilaad & James.

The first filter you hear is the MMF-1, the 2nd is the RES-4 (chord sound) and the low end is the Metasonix R54.

I've been looking for a decent analogue kick for ages, and I've finally found it! Look forward to a review soon.

Thorsten said...

i love it. sounds verry nice . i will try to do it with my maths.
how do you do this with a mats and a doepfer filter ? with filter do you prefeer ? sorry for my stupid question !
br,cit

Navs said...

Have a look at this thread for info on filter pinging. My description there is straight out of Florian Anwander's excellent Synthesizer book. If you haven't already, get yourself a copy!

thomas grey said...

Too bad Florian Anwander's Synthesizer book is only in German... I wish I could read German.

Navs said...

I mail him every year to ask if I could translate it ...