Can you get your hands on one loaded with v3? I think you’ll like it. It’s a close call. For me the FI beats the C4 because it can have an organ-gate amp envelope shape (basically full on, constant volume, to off) which starts when a note is played and stops either when the note is stopped or when the bass’s volume drops below a certain level. It will sustain for ages too. The C4 by contrast either tracks the volume of the input signal or, when an oscillator’s envelope is set to “off”, or is constantly on, changing pitch when a new note is played, but continuing to sound even when the bass’s note is muted.