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Hi guys, this is gonna be my last message here regarding the FMDRIVE 2612 Vsti before I open a proper thread
Might be of interest , basic audio compare between sega megadrive hardware and the software...

Hi, This is going to be a long post regarding the tfi format conversion and the detune parameter DT..
There is an error in the tfi format conversion that should be corrected..

If you implement a software with a tfi import function,you cannot simply read the tfi DT bytes because it is a conversion from the original YM2612 DT register.

First YM2612 Register DT ranges from:

DATA  0 - 1 - 2 - 3 - 4 - 5 - 6 - 7
----------------------------------------------------
PITCH 0  -1  -2  -3   0   1   2   3

small decrease on the pitch (from 1 to 3)where 3 is max.
small increase on the pitch (from 5 to 7)where 7 is max.

So the maximum detune between two operator is:
3 from max decrease and 7 for max increase.

In the tfi 42 bytes long format, DT parameter was converted
following a table and adding +3 to the register value.
Like so:
DETUNE TABLE(8)
0  1  2  3  0 -1 -2 -3

Conversion happens like so:
--------------------------------------------------
-Converters read the DT register
-DT register is converted to the table value
-Add +3
Result will always give values ranges from 0 to 6.

So DT register will be written in .tfi format like so:

DT REGISTER    0 - 1 - 2 - 3 - 4 - 5 - 6 - 7
-------------------------------------------------------------
DT TFI FORMAT  3   4   5   6   3   2   1   0

The tfi DT byte is read like so in softwares:
DT TFI FORMAT                                0 - 1 - 2 - 3 - 4 - 5 - 6
------------------------------------------------------------------------------------------
DT VGMM,TFMM,DEFLMASK etc     -3  -2  -1   0   1    2   3 

If you followed so far you can see that the parameters are inverted were 3 is -3 and so on.

More, If you extract a tfi patch with the very useful GenKmod the DT bytes will be saved with the original register value witch is plain correct but will produce incorrect values in every trackers that followed the tfi DT table...

So for compatibility with my FMDRIVE 2612 Vsti and LittleScale Genmdm Midi Interface I have rewritten a vgm2tfi 2.0 converter that output direct DT register values (0 to 7) with no changes.
and a classic one for compatibility sake with a reverted Dt table.
AJ.

Beer accepted
I am going to post something really interesting regarding the so called  CSM Mode ! Speech Synthesis on the Genesis...

When activated We are in SPECIAL MODE plus Auto KEY ON/KEY OFF is pulsing @ the TIMER A RATE.
Defining some different frequencies in the vocal range on the operators and toying with the timer A gives me a really nice output and a basic proof of concept that it should be usable...at least on the FMDRIVE!  Seb if you got the time to  test it out on the hardware if would be cool
It seems that timer A ranges from +/-19ms down to 18.77µs... my emulation cannot go down this low for note on/off but we can reach 8000BPM easily without CPU killing, very usable range!...

CSM speech audio recording are very rare so...I will drop a vid with a sound recording from the FMDRIVE IN CSM MODE ASAP! ...I mean 2day

Hi Seb,
I'm actually coordinating with a bunch of developer (Apollolux), (ValleyBell) (superjoebob on SpritesMind Forums) to have VGM2MIDI dump YM2612 registers to MIDI CCs!  I have send them the actual v102 CC MAP for direct compatibility in case of fixed CC...hope it will go somewhere..:)
by the way what is the state of the second GENMDM row (witch I am in) I actually have to wait for the device to implement the controller version of FMDRIVE 2612
Also I saw your SN76489 teensy thing, do you provide the arduino code somewhere ?
++

A Kind of reverse genmdm, yes lots of work indeed but could be fun!

Between
-Added .tfi export to FMDRIVE 2612 Vsti  also save as plain text decimal data
One ot two more thing to work on for the SSG part.. and we are close to the release
++

So the midi out of your max patch contains raw midi data converted from the vgm, that is great so if we send the midi out to a synth or whatever it will receive midi notes / per channels + cc ? That is huge , so The psg midi data for exemple to anything that received the right channels?

So here is my little contribution a vgm 2 genm converter...it could be useful if you want to process some vgm's that were not included in tfi packages
or convert some personal vgm instruments...
tested and works fine

Give it a try!
The only thing we got to get right is the DEC2 (secondary decay) parameter, I tested both with mine and your tfi 2 genmdm and also directly reading from actual tfi / vgm files.
DEC2 secondary decay ranges from 0 to 31 not 0 15
so if you try to load and instrument that has more than 15 on the secondary decay (say 25) the value will be 15 anyway when loaded to genmdm editors causes differences in the sound.
Check out some of your genm files you should find quite some with more than 15 on DEC2.
Also as 0 15 is actually mapped to 0 127, a 15 on DEC2 correspond to 31 on the hardware and so on...
Whether or not you change the range on the editors or on the tfi/vgm data import will make the problem solved.

I do not know if it makes sense...maybe I do not understand some internal conversion well...you tell me

//----------------------------------------------------------------------------

// VGM2GENM v1.0 by Aly James, 02.01.13
 

//for use with the GENMDM Midi Interface by Little Scale
//based on original vgm Shiru converters code
//small command line tool to convert VGM files to GENMDM Bank Instruments Presets

//----------------------------------------------------------------------------

Simply drag and drop a .vgm file onto vgm2genm.exe
will output a .genm file in the same forder
You can drop many vgm at the same time.

You can also process a whole directory with all sub folders
using this command line with cmd.exe :
vgm2genm.exe [path\\]* to process whole directory with all subdirectories

source included : need Zlib to compile.
Have fun!

AJ.

https://dl.dropbox.com/u/58656523/VGM2GENM.rar