i'll see if i can't get my camera to cooperate...most days, it's as fickle as a 14 yr old girl...if it decides to play nice, i'll post some pics of what we've done so far later on today 

thank you all for the help...i've never dabbled in guitar electronics before this project, so everything is completely new so far...

i went out and bought him a cheap microphone yesterday, came home and removed the speaker from the small amp, installed the driver in it's place, ran the guitar to the small amp input, the mic to the larger amp input, held the mic and hose together, and it works 

now that we know it works, i'm willing to go buy a better horn driver for it...right after i build a little internal amp and move the driver back to the original enclosure along with the setup from the schematics we were working from.

thanks again 

Ok, i think it all makes sense now...i was curious though because there are two input jacks on the practice amp.  That's why i was asking about sending the signal back to the amplifier to be output through the amp speaker.  i wasn't sure if the inputs were entirely separate or not...

i'll be getting him a microphone today, and he has a second practice amp that we can use as well.  i'll have to get a perfboard and make him an amp to have installed inside the talkbox housing later...i'm guessing something like the little gem, or the ruby amp...until then, he'll just have to have a talkbox the size of his 10w practice amp   

Okay, so if i bought a microphone, can i install the driver in the practice amp so that the guitar signal is sent to the driver, the sound that comes out of the tube, and into his mouth, is then picked up by the microphone, which is then sent back to the practice amp to be played through the speaker?

or am i still being a bit of a techno-idiot...?

apparently my last post didn't take...not sure why, so i'll try again...

the short version is my son and i built a talkbox (link to schematic used below). After building it, we realized that it doesn't have it's own amp, and it is made to be used with an amp that is seperate from the speaker (i think).  We want to install the driver inside his spare practice guitar amp (link to the amp below as well) to avoid having to build an amp to put inside the talkbox housing.  Is this possible, or am i completely mad...

if i need to post pictures of the inside of the guitar amp, i can...

talkbox: http://www.blamepro.com/talkboxG.htm
amp: http://musiciansdiscountwarehouse.com/new-electric-guitar-practice-amp-free-shipping.html