2 seconds = 16khz sample rate = 8khz max frequency without aliasing (see Nyquist).

1 second = 32k sample rate = 16k max frequency

Steep filters are easy in the FV-1, so you can filter aliasing without losing as much of the instrument signal's bandwidth. Not so with the PT2399, so longer delays will always mean more grunginess and/or more loss of high frequencies.

You're right that DIYers are scared of SMT.

BTW, if 14 bit is too low bit depth for you, run fast from the PT2399, which AFAICT is 10 bits.