I use IKMultimedia’s MODO Bass. I’m having trouble building an Instrument that correctly sounds 1 octave below what is written AND when selecting Concert Pitch displays those notes as “sounded.” Using the Instrument Definition Editor, the Transposition entries behave oddly when trying to select C4, C3 it shows 0 half-steps separation. but C#3 to C4 shows -11 half-steps. Anyway, I’m a newbie, fresh off the Finale boat. Any advice, pointers, or tips?
You shouldn’t need to use the Instrument Editor for bass guitar - it should be possible to make this work with the existing bass guitar instrument. I suspect the problem might be that you need to choose an appropriate expression map for playback, though - often bass guitar samples are transposed to make them easier to play “live” on a MIDI keyboard. This is true for the bass samples that come with Dorico, for example, and so they have to be used with the “Transpose up 1 octave” expression map.
Perhaps if you could start by telling us what problem you’re having with Dorico’s built-in bass guitar instrument?