Well I finally got over the exessively loud speaker on the TTI. I had a look at the onboard speaker and decided playing about with that was unviable, so I then tried foam inside an extension speaker. That didn't work, so then had an idea of using some headphones that had volume controls built in. Out to the shed and after a rummage found some old phones that fitted the bill. Plugged 'em in and Voila!, brilliant. I have them hanging underneath the bench with the volume at a reasonable extention speaker background level. Another problem solved.