According to several post Ive read about using a tube compressor,it seems like the use of any other compressors is a waste of time and money. I plan on buying a tube compressor here shortly,but in the mean time,Im stuck using my Alesis 3630. Which tube comp should I look for ($500.00 range)--------and my next question---------------what do you think I can get away with (safely) when using the Alesis comp? :? And last but not least-----why do tube compressors sound better?