1984 年，Dave Smith 和他在 Sequential Circuits 的团队发布了 Six-trak，这是第一批不仅具有当时新的 MIDI 控制系统而且是早期的多音色产品的乐器之一。这是一个相当先进的技术功能，可以在当时相对实惠的合成器上看到。虽然我们都知道 Dave Smith 是模拟合成器设计大师，但在设计他的设计时，我经常会想，事实上他的编程技巧真的应该得到更好的表扬！将带有补丁调用、琶音器、音序器、堆栈设施和极其完整的 midi CC 实现的整个多音色合成器控制系统安装到一个运行频率为 4MHz 的不起眼的 Z80 微控制器中，其代码驻留在一个微小的 16Kbyte EPROM 上，这确实是一个相当大的成就！
In 1984 Dave Smith and his team at Sequential Circuits released the Six-trak which was one of the first instruments not only to feature the then new MIDI control system but was an early multitimbral offering. This was quite a technically advanced feature to be seen on what was a relatively affordable synthesizer in those days. Although we all know Dave Smith as a master of analog synthesizer design, whilst working on his designs, I am often left thinking that in fact he really should be better praised for his programming skills! Fitting a whole multi-timbral synth control system with patch recall, an arpeggiator, a sequencer, a stack facility and an extremely full midi CC implementation into a humble Z80 microcontroller running at 4MHz with its code residing on one tiny 16Kbyte EPROM is really quite accomplishment!