So, I picked up an old Laney TF400 a year or so ago and discovered there is very little info available online. I even posted on here and (unusually) drew a blank... Anyway, today I contacted Laney customer service with an email query and got my answer and a pdf of the manual back from them WITHIN THE HOUR. Just thought I'd give Peter at Laney a shout out and a public "thanks". Credit where credit is due... Cheers all.