This book has 30 projects to build based around musical instruments. Projects include - metronome x 4, guitar practice, accompaniment drummer, guitar bass booster, treble boost preamp, presence boost, connecting guitar pickups, guitar preamps, practice amp, envelope control, distortion box, waa waa, echo and reverb, tremolo, sustain, phasers, bonger, percussion box, sound generators, organ, etc. 52 pages 135 x 210mm.