My harmonizer produces a 3rd and 5th by analyzing the chord verses the vocal input. Why is there no pedal to extend this to the bass range? A Digitech Trio is no good because you have to teach it the parts it does not auto follow.
Some things that come to mind:
- You couldn't be talking about an octave pedal, could you? They are pretty common.
- I think i read an ad for a "bass emulator" of some kind in a guitar magazine from 1996.
- I know someone who has an Eventide (delay) pedal which can work as an arpeggiator, you basically teach it an arpeggio and it arpeggiates the notes you play.
- A midi (hexaphonic) pickup would allow software to control a bass synth/sampler or harmonize your guitar live.
- I'm pretty sure there exists such a device that allows you to play bass notes with your feet.
Feel free to do research on those options on your own, i have some other options for you here:
An octave pedal/pitch shift/harmonizer with a looper. Look within your budget and try to find alternatives that fit your situation. If you simply need bass accompaniment, get one that has some memory locations (hundreds of loops would not be uncommon) and prerecord bass loops using the octaver. If your music is more improvisatory, or "in the moment", look for features that let you seamlessly build loops in the middle of performance, without for example having to stop the machine. Multitrack loopers are great if you want to stack parts and take them away in a particular order.
Get to know some other musicians. A good bass player can be hard to find, but seems like just what you need. I'm no expert at finding people, but usually it's worth a try checking if you know somebody who knows somebody who knows somebody who's got some chops and spare time. An ad at a music store or music school could also be worth a shot. And if the music and/or salary is inspiring enough, they will come.
Hope this is helpful to you.