spfx1 is an eeprom which adds custom fx to the mfb synth pro. the new effects are stereo and are an improvement on the stock fv-1 rom programs which come as standard.

“I had time to test your eeprom, and it is fantastic” - Manfred fricke, berlin, germany

“Dope effects! Adds so much more to be explored, especially in an experimental type of setup” - clinton mcdaniel, salt lake city, usa

“Sounds great!” - joe flory, abbeyvale, uk

“I'm liking the tape delay and triple delay so far!” - neil bates, manea, uk

please note that some recent synth pro units do not have the dip-8 socket for the eeprom installed, so it’s a good idea to check inside your synth to see if the socket is there. if it does not have a socket, installation is relatively easy but requires removing the top pcb and soldering the socket pins from below. if you want me to install the socket and spfx1 in your synth, select ‘spfx1 & resistor upgrade’ in the store. if you want me to send you a socket with your spfx1, drop me an email and let me know.

the effects added are:

1. spring reverb

2. chorus with reverb

3. delay with reverb

4. stereo delay with reverb

5. tape delay with reverb

6. triple delay

audio examples can be found below

installation is easy and full instructions are provided on the spfx1 installation page. to access the new effects, hold down button 8 during power on

click on the store link above to purchase an spfx1 with free uk delivery

for reference, here are the examples above with no effects: