Excel-o-Tone musical keyboard Hong-Kong 1984 The Excel-O-Tone is pretty much a "dumbed down" clone of legendary Casio VL-1. Labeled in French, very hard to find version. Main features: -25 button keys -2 loudspeakers -switches for volume (4 steps), vibrato (genuinely tremolo), tempo (4 steps) -simple sequencer (record/ playback) and learn mode -monophonic plain squarewave sound (not crystal clocked) -10 short demo tunes (rather simple monotos) -display with LEDs -Headphone output (3.5mm) -Battery powered (4x AA @ 1.5V) -2 extra spots to store batteries -DC IN Weight 425g 33cm x 7,5cm x 2,3cm This instrument has the likely world- slowest responding keys; they sometimes take up to 0.5s to react on a key press. By pressing "AUTO", any of the black keys play demos. In the battery box are 6 places for mignon batteries, but only 4 have contacts. At the remaining 2 was a sticker: "TO INSTALL SPARE BATTERIES", but this looks quite unlogical, because the instrument needs 4 batteries and mixing old with new batteries can result in leaking, thus I guess the plastic case was designed for a different hardware variant; also the fact that the "vibrato" slide switch has 2 "off"- positions (off, on, off) is evidence for this. On the battery cover stands "PATENT PENDING 1007823" Ideal for collectors and for circuit bending!