With respect to Terry I have discovered that the Q2 is most likely the problem as these units are not designed for guitar input signals which I found to my cost back in 2000 when I bought a brand new one and quickly dispatched it again because I immediately noticed the sound had been compromised.
The Quad GT however is a different animal and matches perfectly with a guitar.
The problem is that the Q2 loses all the 'soul' of the guitar and produces a sterile tone that ended up costing people thousands of pounds and lots of stress back in the day. One person is still trying to make pedals to give 'That Sound' to make up for the shortfall of these devices. Without question, the only person to have succeeded is Paul Rossiter with his TVS models.
Terry is correct about the TVS3 being at the pinnacle of electronic echo machines, but other than the Quad GT, the Quadraverbs all come at the bottom of the pile after Magicstomp, Zoom, as far down as the humble NUX Tape Core pedal that I picked up for £45. The next best to the TVS3 in my experience is the Atlantis 1 which I was lucky enough to be able to do A/B comparisons until recently selling mine. Similar tests with an Alesis Q2 were a million miles apart and clearly the reason Hank got rid for the TVS3. The only way to get a Q2 anywhere near the tone required is to feed it through the TVS circuit which gives it some life. Paul Rossiter designed his TVS1 originally for that purpose but quickly decided to build the whole thing which developed into the TVS3.
I have a Vox Tone Lab LE which is very good as I programmed it with all the Shadows echoes, but it has been replaced with the humble Zoom G3n which has a superior computer chip and delivers what no Quadraverb ever could. The cost is minimal to what it used to be, it's called progress.