Does anyone know if these are identical? The SP-32 is not specified for the PX350, only the SP-33. But the SP-32 costs quite a bit less. I know the SP-33 has a special dedicated connection and I can't find any info as to whether the SP-32 is the same. I am using a single Casio sustain pedal but would like the added functionality of the 3 pedals, or at least a soft pedal function which I see can also be achieved using 2 separate pedals in the 2 standard 1/4" pedal jacks. Thanks.