![]() There’s also a monophonic bass section generated by an 8253 programmable divider. There’s a lowpass state variable VCF for the guitar, brass and accordion sounds, and a second one for the guitar sound in the accompaniment section. The cymbal and hihat sounds are also different, but otherwise the later models have the same drums, chorus, and the sampled solo section from the K250. The older models seem to use a different tone generator, but I don’t know the specifics. The master clock is 2 MHz, and this is fixed with no vibrato at all for the polyphonic voices. The main tone generator for the polyphonic section in the second generation models is the MSM5232, like the Korg Poly 800, SAS-20 and PSS-50. All models have an excellent 3 BBD stereo string ensemble chorus with several modes, again derived from the full size Technics organs. The main tone generator is basically analog divide-down, although I don’t think any of these models is fully polyphonic. The K250 uses a sampled solo section that seems to have been introduced with the E series organs in 1983. The K200 includes an analog solo section with a VCF. Technics claimed that these were the first home keyboard and organ models to use sampled drums. These all have sampled drums, originally from the SX-U90 in 1981, although the cymbal and hihat sounds are still analog. The second generation (1985-86) included the SX-K300, K350 and K450, as well as the cheaper SX-K50 and SX-KM5. The first line of Technics home keyboards consisted of the SX-K100 and K200 in 1982, followed by the K150 and K250 in 1984. I’ve made a multitrack recording and sampled the drum sounds. My latest acquisition is a Technics SX-K450 keyboard. ![]()
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