The volume knob does impact the tone. The sound of the strings sounds different at 100% vs 90%, 80%, or ever 75%.
A lot of times, I prefer the tone of the bass with the volume at 90% vs 100%. Couple that with the tweaking the tone knob and you will get a lot of variety... subtle variety.
A lot of times, I prefer the tone of the bass with the volume at 90% vs 100%. Couple that with the tweaking the tone knob and you will get a lot of variety... subtle variety.