that Boss Delay schematic look a little too schematic. IC14 ("LFO" - Low Freq Oscillator) feeds the "Clock Gen" only in chorus mode. In echo mode it gets a second control knob but sits there doing nowt. There is something implicit they aren't telling you. BDB looks like yer main delay (Bucket Brigade Device - delay set by "Clock Gen"), set by the clock frequency, but FCF beats me. Is it a Fully-Connected Filter (?) or a Frequency Correlation Function (aka a phaser?). The circuit diag doesn't give me much more. It would be interesting to know.
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