Some of you may be familiar with the old Maestro FSH-1 Sample and Hold. Great pedal, though a rather niche market. Unfortunately it depends on a chip which is now out of production. Fortunately, one of the folks on the DIYStompbox forum adapted the circuit to a currently-available chip, and in a blessedly smaller package (it was a big'un) ( https://www.effectsdatabase.com/model/maestro/fsh1# ). For the uninitiated, a sample & hold takes "snapshots" of the momentary voltage from a noise source, and "holds" it until instructed by a clock to take the next sample/snapshot. Because it's a noise source, each snapshot is generally different from the previous one in unpredictable ways. The sampled voltage is then used to set the resonant frequency of a filter, which will bop around unpredictably. This also depends on the quality of the noise source. While the particular transistor type used as the noise source is actually a pretty common one, you need to "audition" them for noise characteristics, since those vary from unit to unit, even within the same manufacturer and lot number. The adapted circuit is actually a reduced version of the original. On the original, you can see a slider switch that says "Filter Sample/Hold". In the Filter setting, the unit behaves like a fairly normal envelope-controlled filter (autowah). The adapted circuit skips that and concentrates on the S&H part only, which allows it to be smaller. I etched the board that the fellow generously prepared a layout for and posted, made a few mods, and the demo video is below. The sound is lousy because I didn't turn down the mic sensitivity enough. BUt apart from that, you'll hear the range of things it can do. The controls are labelled SPD (how quickly it progresses from sample to sample), RNG (the degree of contrast between samples permitted), BIAS (tunes the filter to higher or lower frequency ranges), RES (sets the degree of emphasis around the resonant frequency of the filter) and a toggle marked DROOP. The DROOP function is something I think I may have originated. Normally, the filter operates in steps. (Some other pedals have used a S&H effect and often labelled it "stepped") It gets to sound like a step because the sampled noise voltage is held onto by a storage capacitor in a stable manner. The droop function provides a way for that capacitor to actually drain off before the next sample is taken, such that each step is a kind of mini-sweep. It's a different sort of effect. There are times and settings when it reminded me a lot of the theme "Tillicum" by Syrinx, from that old CTV show "Here come the '70s". The effect is limited in its usefulness, much like a ring modulator, or even an octave divider. But it's a neat effect.