Disrupitor

I've got a digitech RP-300A, a lovely little multi-effects pedal that I enjoy using, and a Fender Frontman 25W amp.
This is the problem: there seems to be no possible way to connect the box to the amp without it being obscenely loud. So far I've *fixed* this problem by turning down the volume of the pedal down to around 3 (out of 99!). The problem is with that is that the pedal defaults it's volume to 34, enough to blow my poor little amp. I'm afraid somebody (such as my brother) will turn both of them on without realizing what they're doing and ruin my gear!
I'm running the pedal to the amp using the headphone output on the pedal to the aux input on the amp.
I've also tried running the left output of the pedal to the main input of the amp using a normal guitar cable...this almost works, but the volume on the amp has to be kept around .5, or else it gets dangerously loud.
From what I can tell, this problem is the result of the pedal's preamp amplifying the signal, then sending it to the amp, which also amplifies it, resulting in a really loud signal.
Is this what's causing my problems? If so, how do I fix it?

This was my first attempt at songwriting. The older version wasn't very great, so I cleaned it up and rerecorded it (with new strings!).
The thunderstorm in the background was taken from one of those "soothing sounds" cds I had laying around.

Enjoy!

Okay, there's a little bit of a story behind this...
I wrote this song for my girlfriend, an exchange student from Germany. She's returning home in around three weeks, and it's going to be another year until I see her again.
Enjoy.