So I tested the Pyle Box which is a bass/guitar direct box and found it does work for my purposes. I tried going straight out of the M-Track Duo main outs to the PA speaker amp consumer line input and it worked but there was a Hum. The 1/4 inch to RCA cable was not a TRS 1/4 plug so plugging into the Balanced 1/4 main output on the M-Track shorted pin 1 shield to pin 3 low on the XLR input going to the Pyle box. When I ran a TRS 1/4 to XLR cable from the M-Track Main Output to feed the Pyle XLR input/output connection and took Unbalanced instrument input connectors and connected them with the 1/4 unbalanced to RCA cables to feed PA speaker amp consumer line input it worked but depending on the position of the ground lift button the hum would come and go. The ground lift button shorts pin 1 shield of the XLR connector of the Pyle box to chassis ground.
I found that I got a little more power out of the Headphone jack than the main outputs. I did some googling around about +4dbu compared to the headphone output of 60mW/ch into 32 ohm and came up with the headphone works out to roughly +5.1 dbu which explains why it's a little louder than the main output. So far it seems that going the extra mile for a isolation transformer is worth it to eliminate the hum. I was surprised that I didn't need to use the attenuation switch on the pyle box. I guess because I'm feeding from volume controlled outputs of the M-Track it wasn't overdriving the consumer line level inputs.
Here are the M-Track output specs for the nerds I try my best to emulate ;-)
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