The A-188-1 is a Bucket Brigade Device that can be used not only for flanging and short delay effects, but also for Karplus Strong synthesis as an oscillator. Here’s a short sound demo:
Patch used: An A-155 Sequencer triggers an A-142 VC Decay envelope which controls an A-132-3 VCA (short decay time). VCA input is some noise from an A-117. VCA out goes into an A-188-1X BBD. The BBD frequency is controlled by the A-155 and an A-185-2 (to switch octaves – something like octaves: 1 oct down every 30 seconds).
In the feedback loop, an A-108 is inserted with bandpass out, no emphasis and manually changed filter frequency. BBD output is sent into another A-108 (filter frequency is controlled by BBD frequency VC out), the 48dB out is then sent into DAW.
Technical details on this module can be found on Doepfer’s homepage: