@ rqstudio: or you can do a search on 'factory reset'. You'll find:
1. Power on the DM-3200 while simultaneously holding down the following buttons: SHIFT + 1/L (Output Select) + 2/R (Output Select)
2. Cursor down and select SRAM INIT. Press the ENTER button twice.
3. Cursor down and select EXIT. Press the ENTER button.
Thank you Jarno, good to see you're still around but I looked and couldn't find it. Thank you Headroom for spelling it out for the tired old man that I am. Haha