If you are going to use a bass guitar, increase the value of c1, especially you shrink the 2meg input load. 10uf on the output isn't too bad for frequencies down below 40hz and above 20hz so long as you shrink the output R3 2meg resistor to something normal like 100k. Don't worry about the drive, that's the purpose of the op-amp, to drive the 100k without signal loss & to drive the cable and next external device stage even if it is something like a 50k, or 10k load.