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Might be of interest,

I have just set up a quick soundcloud place for alyjameslab previews etc...better than youtube soundwise
A basic chippy jazzy slow loop first recorded in Cubase with FMDRIVE then converted to a VGM with mid2vgm,
later into a binary ROM that plays on the Sega MD1 Hardware.
The track is the exact same track (except some minor timing issue when changing program change in the vgm..some quirks..)

1 Hardware
2 FMD MD1 mode
3 FMD HQ mode

http://soundcloud.com/alyjameslab/sets/ … st-demo-01

Someone reported me that loading this into VFX do not work...So AFAIK, only WIN for now. sorry 4 that

Absolutely right
It is not really easy to program to actually produce understandable speech  but the technology is definitely here in the YM2612...
I have made a few video on the FMDRIVE VSti to showcase what you can do with it.
I have found some rare use of CSM inside some Game Arts games for MSX:
The Silpheed game on PC88 MSX computer featuring a very similar chip than YM2612 wih the exact same CSM feature.
In use here to produce the robotic speech:

and Here:

The FM sound of YAMAHA has the ability to key-on / key off immediately (some channels) or all channels when the timer A built-in overflows.
It is called "CSM speech synthesis mode" and stands for Composite Sinusoidal Modeling.
A type of speech coding, CSM speech synthesis is a technique to reproduce with the combination of multiple sine wave, the original data of a vocal sample. 

There is a theory using FFT to "de compose" the frequency content of a signal into a sum a different sine waves, in the time domain with different pitches and volume.
Based on this theory, If you play at the same time more than one sine at an appropriate TL volume and frequencies , you can reproduce the waveform similar to the original waveform.
YM2612 can output 4 sine with 4 different Frequency and 4 Different TL volume.
FMDRIVE Vst uses that with MIDI CH1 , 11, 12, 13 to control Frequency and Volume an additional CH 14 to control the timer A.
You can also midi learn these controls to any midi controller and you're good for some live talking shit

This mode is also useful to output new type of sounds similar to having a powerful filter on board...and that is what is very interesting in addition to the speech thing.
My testing have shown some really cool stuff

Ok guys
let me write a basic instruction for the joypad control...later I will also release a more featured one that uses both joypads and combination of buttons...

I repost this 4 Seb, might be useful..:)

Straightforward implementation of the CSM mode will be cool but I will add some details and notes regarding the way I have used it in FMDRIVE to Seb and anybody who will need to implement it
Being not familiar with music trackers I am more inclined to use DAWs.
Actually (until I got my GENMDM)  I use Valleybell mid2vgm that is working fine to convert MIDI data to VGM except it did not convert yet CCs to YM2612 registers and pitch informations sometimes ends wrong.
Freedom of composing music in DAW with FMDRIVE instances and then play it on the console after conversion is pretty cool until I can live control the GENMDM with FMDRIVE .

Oh and I will release that particular ROM if there is some interest, it works on the hardware and should also works in emulators that support CSM mode correctly... IIRC REGEN do.

checked
no SN76489 for now , but they have a bunch of nice DAC might be cool for some of my guitar bite crushing stuff...