The following will allow you to operate the BDI21 V-Tone Bass Driver DI to its full potential:1. Connect your bass to the input of the BDI21 using a 1/4" instrument cable.2. Connect your amp to to the output of the BDI21 using a 1/4" instrument cable.3. Connect the Bal. Out of the BDI21 to the mixing console using a standard microphone cable.4. Use the DRIVE control to adjust the amount of gain and overdrive.5. Use the PRESENCE control to boost the upper harmonic content for a smoother high end and attack.6. Use the TREBLE control to govern the high frequency range of the signal (+/- 12 dB).7. Use the BASS control to boost/cut the low frequency range (+/-12 dB).8. Use LEVEL control to adjust the overall volume.9. Use the BLEND control to adjust the amount of tube emulation.As always, experiment with the controls until the desired effect is achieved.