Hi MZ Love,
I am not using one but looking at the manual for the TC-Helicon VoiceSolo
I am wondering why you are asking.
Do you have the TC-Helicon unit now?
Do you have an L1® and if so, which model?
The TC-Helicon unit appears to be designed as a personal monitor.
The L1® was designed eliminate the need for monitors.
See the The L1® Approach and the History of Amplification
for more details about that.