service manuals (a whole bunch of them)

[dai h.]

synth-oriented site, but lots of guitar related docs as well (Boss, Roland, Maestro, etc.)

SYNFO - THE 20th CENTURY SYNTHESIZER DATABASE

[dai h.]

couple more efx schemos (not sure how unavailable they are but the Boss GL-100 schematics seem to show more detail in the channel switching paths explanation compared to the service manual in the above link) :

Index