There is an impedance "matching" issue to always consider when connecting professional audio gear.
In order to have an efficient (and therefore good sounding) transfer of signal, the input must be rated for at least 10 times to 100 times the impedance rating of the source.
For example, a Sure SM58 sends out about 150-300 Ohms. A mix input on a mixer is rated at about 2,000 - 3,000 Ohms. There is the 10x factor.
Your pedal has an input rated at 1,000,000 Ohms (1M), while your guitar puts out probably 2,000 - 5,000 Ohms (2K - 5K). Here is the 100x factor.
The little inline lowZ to highZ transformer you have is designed to plug professional mics into guitar amps. Not sure exactly what it is doing for you in terms of impedance using it backwards.
The best approach is to pick up an inexpensive DI box (ART, Whirlwind etc.) for about $50. Run the 1/4" out of your pedal into the DI box input, then the DI box XLR output into your powered speaker or a mixer etc. That also converts the unbalanced signal into a balanced signal which will be much more interference resistant (use as short a 1/4" cable as possible).
Hope this helps!
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