Silver Melody szintetizátor

SILVER MELODY R4943 Analóg squarewave szintetizátor

Igen ritka analóg squarewave szintetizátor a '80-as évekből, melynek szíve egy eredeti 40 pines ZILOG R622 -es chip.
Ennek a rendkívül kezdetleges, öreg chipnek a hanggenerátora még külön lábakra dolgozik, azaz a chip pin-jei egy-egy hang kivezetése.

Tulajdonságai:

- ZILOG R622 chip
- 2 hang poliónia
- 8 külünféle (bizarr) hang
- 8 különféle kíséret
- 4 különféle drum pad
- Sustain és Vibrato effekt (nagyon bizarr)
- Sequencer
- Sztereó
- Külön L és R kimenet
- Adapterről,és elemről is üzemeltethető
- Stb...

A chip angol leírása:

The sound generator uses analogue capacitor envelopes and all accompaniment voices have own pins. This CPU makes nice analogue distortions and seems to have a VERY bizarre concept of implementing the 2 note polyphony. The first pressed key not only causes the generation of a squarewave tone, but also changes a sort of internal subclock speed (about up to 10%?) depending on which note is played (apparently as a correction term to fine tune the note due to an otherwise too coarse internal frequency lookup table or something similar). When a 2nd key is pressed, the CPU though has to generate a difference frequency to the previous note regarding the changed clock speed, which causes all kind of weird intermodulation distortions those are especially audible when the capacitor envelope of one note has faded silent while its tone generator still sounds through the 2nd note with a ring- modulation- like effect until the CPU finally shuts down the silent note completely. The keyboard matrix signals, rhythm speed and a zillion of other things though wobble around in bizarre ways by the changing clock speed. Despite the CPU itself is crystal clocked, also various short, howling glitches get audible when additional keys are pressed due to the CPU determines by the relative key position order which tone should be played by which oscillator; though a tone played by the 1st one may suddenly jump to the 2nd when a lower note key gets pressed; especially in accompaniment mode (where 3 voices exist for accompaniment) this is very audible.