I purchased an XLR to 1/4" cable to be able to use a guitar amp as vocal output when I do not have access to the PA. The male XLR is plugged into the mono voice output of my VL3 and have the 1/4" side plugged into the amp input. I cannot get any sound (vocal) to come though when I plug my guitar into the guitar input of the VL3. I even tried the monitor out, but I get nothing. The cable itself works as I have tested it with the amp by plugging the microphone directly. When the PA is connected to the same output with a standard XLR everything works fine, but I need to be able to connect to a guitar-type amp when practicing. If I unplug the guitar from VL3 input, it works. Is this because the unit is sensing the hybrid XLR cable as a second unbalanced output or something else? Or am I missing a setting? Please help! Thanks!