... this is the actual explanation for what is going on inside of the 909...
Bass Drum:* Aaah, this is perhaps the noise that the 909 is most famous for, and with good reason. Its sound has two parts, sine wave and noise, which are mixed together before amplification. The sine wave's frequency is controlled by the tone knob, and is generated by clipping a triangle wave, giving one factor of its unique sound. This wave is passed through an envelope generator with a knob-defined sharp attack, then a flat mesa top where a gradual peak would be expected, and a knob-defined slower decay. It is this envelope, which looks essentially like an extremely compressed bass drum, which really gives the BD its whomp after amplification. Noise is taken from the instrument's common noise generator, and is mixed in at a fairly low overall level -- still, it is this noise which is amplified or distorted to get an early 90's hardcore rave sound.
Can any one create a tutorial on how to do this? I've worked with sound before. Yet, not at this level. I've yet to work with the LFO's on my Akai S-2000 because I could find no one to walk me through what they are and how to use them. Thanks again!!
Mad Cherokee