Success!!
I finally was able to burn a custom sound rom for the HR-16! I encoded
the audio at 8bit. You can listen to a sample here:
http://burnkit2600.com/gear/ p=17
I know this is a bit different than the 707, but i'm sure there are
some similarities. Just wanted to share...

-justin
= burnkit2600.com =

--- In tr-707@yahoogroups.com , "kingconga42" <kingconga8@...> wrote:
>
> Well, i've done a few more experiments with trying to burn custom
> sounds for the HR-16. I dont think it uses any pin swaps or weird
> stuff like that. I'm running into problems tho. I can replace
> individual sounds, but they sound distorted when played thru the HR16.
> I know very little about how sounds are encoded to PCM. I think i'm
> getting what is called "quantization error noise." I think i neeed
> anti-aliasing filters and dithering.... I am using Goldwave to open
> the BIN as raw audio, and then replacing sections of the file with my
> own audio.... Is there a better audio editing program i could use for
> a project like this Or do i need to find out the precise sampling
> frequency, etc, that the company used to sample the sounds
>
> -justin
>
> --- In tr-707@yahoogroups.com , "plutoniq9" <Plutonique9@> wrote:
> >
> > Damn it's been silent in here...... I just ordered some 28-pin sockets
> > so I can start experimenting with new sound eproms.
> >
> > Because it's "nearly impossible" to read the Roland Eproms, burning
> > new sounds will just have to be based on whats in the service manual &
> > a lot of expermentation....... It would have been cool to look into
> > the original ROM's, to make copies and see exactly how the data is
> > organized or if certain samples are lower/higer sample rate than
> > others.....but you'd have to modify an older eprom programmer to put
> > out a clock signal on every address-line change.....
> >
> > Probably won't have much time to experiment until after June 7th
> > though, so just wanted to drop a line and let people know this project
> > aint dead :)
> >
> > Cheers
> >
> > Ryan
> >
>