I wouldn't even if you could. You'll want to mix signals.
Here's the thing though - piezo bridge saddle systems can be found by 3rd parties and a decent guitar tech can probably install them on your fav bass.
If the piezo bridge is the main reason you're looking at the carvins - I'd look into doing the bridge thing to your current bass first. If you're looking for a new bass and carvin is already on your list - my thoughts are you don't get a carvin without the piezos.
I'd actually really like to hear them on a fretless. I think that would sound particularly nice.
Here's the thing though - piezo bridge saddle systems can be found by 3rd parties and a decent guitar tech can probably install them on your fav bass.
If the piezo bridge is the main reason you're looking at the carvins - I'd look into doing the bridge thing to your current bass first. If you're looking for a new bass and carvin is already on your list - my thoughts are you don't get a carvin without the piezos.
I'd actually really like to hear them on a fretless. I think that would sound particularly nice.
) The fact is the MTD and Pedulla both feel and sound better to me than the carvin - but the price thing is huge.