Excel-O-Tone - - Instrumentos musicales (Sin precio de reserva)

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!