I seem to have a dying Firestudio Project interface (it's nearly 10 years old, so I guess I can't fight destiny), but in the meantime I'm limping along on my Audiobox USB.
However, if I have a block size lower than 128, the playback does not go out to the speakers. The meters on S1 and my audio device in Windows both show signal input and output but there is no sound output from the interface to either the speaker outs or the headphone out. At 128 or above, it works. This wouldn't be a problem if I were mixing, but when recording guitar the latency is just too high to be usable. Is this a known issue/imitation of the device, or do I have a misconfiguration somewhere?