Distortion until I change the ROM?

[orizzle]

First I would like to thank everyone for their hard work, what an amazing project. I never had a mt-32 growing up and it's great to experience this for the first time.

I have one issue with my setup:

• Raspberry Pi 3B w/ MT32-pi
• 3.5 mm audio thru pi
• Softmpu in DOS and playmid/gsplay
• Roland serial driver in Windows and mplayer/a game (Odell down under)

MIDI seems to initially play distorted (loud, crackling, possibly incorrect instruments or some instruments louder than they should be and drown out the melody). I added some more roms to my SD card and wired up the button 2 to switch between roms. If I am in the middle of playing a MIDI and hit the button, the sound is much improved - volume decreases, no distortion, instruments correct. If I continue to hit the button, no change.

However, if I stop the MIDI for a second and play it again (without touching the pi button), the distortion comes back, but is again cleared when I press the button to change roms.

I have confirmed all my roms have the correct sha1 and have tried a few different roms on the SD card and no change. This happens in both Windows and in DOS and with all players mentioned above.

Any help is appreciated.

[opjose]

"MIDI seems to initially play distorted (loud, crackling, possibly incorrect instruments or some instruments louder than they should be and drown out the melody)."

That sounds similar to what I experienced with the X950 (other thread)... Some instruments distorted far worst than others and I got the pops and crackling until I disabled the hd44780_i2c driver... though I don't know if the latter is related.

You may want to try removing the serial port connection and utilizing the rtp_midi & loopback drivers in Windows to connect to the MT-32 PI via ethernet and play back a midi file.

You can use something like Cakewalk : https://www.bandlab.com/products/cakewalk?lang=en FREE!!! and VERY powerful!

To play back midi files.