CASIO CT 410V - tones and styles thru FILTER

This is definitely one of the most interesting Casio keyboards, because it features a genuine analogue synthesizer filter with filter envelope and cut- off/ resonance control sliders, lots of accompaniment variations and separate volume sliders. Additionally it has a wonderful "stereo chorus" rotary speaker/ leslie simulator that produces a great sort of "hemi- sync" mind machine effect with stepless adjustable speed, which makes the thing perfect for brain wave synchronization features in psychedelic meditation or tekkno trance music. A smaller version of this instrument with midsize keys and no built-in speakers was released as Casio MT-400V.

All sliders of this instrument are real analogue potentiometers and thus stepless. The stereo chorus LFO can also modulate the filter in "wah wah" mode, which makes the typical "wokachika" sound known from certain 1970th funk (?) musics. The great accompaniment unit has 4 bass and 4 chord variations and the same unique, dark and sonorously droning squarewave bass tones like the "organ" sound of the Hing-Hon EK-001. In fingered chord mode the accompaniment plays the more notes the more keys are pressed, and this works even perfectly with all non- chord key combinations, which permits very versatile accompaniment sound patterns

49 fullsize keys
2 built-in speakers (stereo, reasonable big but sound a bit dull)
8 note polyphony (only 4 notes with accompaniment)
4 note polyphony in chord section
separate analogue sliders for main, rhythm, accompaniment and bass volume
12 semi- OBS preset rhythms {rock, pops, disco, 16beat, swing, latin swing | bossa nova, samba, beguine, tango, waltz, slow rock} selected by locking buttons + select button.
20 semi- OBS preset sounds {organ, piano, harpsichord, flute, oboe, trumpet, violin, celesta, mandolin, funny | pipe organ, elec. piano, vibraphone, clarinet, accordion, horn, cello, harp, elec. guitar, cosmic tone} selected by locking buttons + select button.
chord switch {off, fingered, casio chord}
4 bass variations switch
4 chord variations switch
tempo slider
rhythm fill-in and synchro button
vibrato switch {off, vibrato, delayed vibrato}
sustain switch {off, sustain, reverb.}
analogue resonance filter (12dB?) with analogue sliders for {attack, decay, sustain level, cut off, resonance}
filter input source switch {off, tone, rhythm, bass/ chord, noise} ("noise" = white noise hiss triggered by rhythm)
"stereo chorus" rotary speaker/ leslie simulator (based on a combination of panning and pitch shifting)
analogue slider for "stereo chorus/ wah speed"
main voice sound IC= "NEC D931C 011, 8431KY" (42 pin DIL) with timbres based on 2 mixed multipulse squarewave tones with different digital envelopes, those are differently low pass filtered through capacitors.
accompaniment CPU= "NEC D930G 011, 8434XK" (80 pins SMD) which produces different multipulse squarewave tones (partly with capacitor envelope) and trigger pulses for external analogue drums.
analogue percussion {base, snare, open cymbal, close cymbal, low tom, high tom, woodblock} which apparently uses no transistor noise. The cymbal timbre sounds half- way metallic and resembles the one of Yamaha PS-2, thus it may be mixed from 2 shift register feedback noises.
tuning knob
filter envelope control jack
jacks for sustain and "foot volume" (main voice volume) pedals
jacks for AC adapter, line out and headphone