> No; the first Buchla oscillator, the 158, did indeed have linear FM. Could you point to an authoritative source on this? The Model 100 owner's manual says t

> No; the first Buchla oscillator, the 158, did indeed have linear FM. Could you point to an authoritative source on this? The Model 100 owner's manual says this about the 158: "The frequency modulation control require an external signal input, which determines the rate (speed) of the frequency modulation (vibrato)...". The fact that it says "vibrato" would imply exponential FM, wouldn't it? https://archive.org/details/synthmanual-buchla-100-owners-manual/page/n23/mode/2up https://archive.org/details/synthmanual-buchla-100-owners-ma... Actually, after watching this video (https://www.youtube.com/watch?v=49qyPIX61rg https://www.youtube.com/watch?v=49qyPIX61rg) I'm less convinced that the 158 had linear FM. As he turns the FM knob, the pitch changes. This would be expected for exponential FM.