I can offer some thoughts regarding guitar DI.
IME, it's difficult to get a decent sound from a tube guitar amp plugged into a load box. The speaker(s) and cabinet contribute a lot to the character of the sound; that character disappears when you use a load box. Yes, there are speaker cab simulators available. IME, the inexpensive ones are not a reasonable substitute for a real speaker and cabinet. If you search, you can find a much more expensive cab sim that uses impulse responses and convolution. It's probably better than the units in the $100 to $200 range that offer nothing beyond a simple filter, but...
By the time you collect your amp head, your load box, your cab sim, cables, spare tubes, etc... you're still carrying a lot of stuff.
Have you considered trying a digital amp modeler? Decent units cost (new) from $200 (Digitech RP355) to $900+ (Avid Eleven Rack) and are designed to sound like a mic'd amp. Bonus: they also have FX. Great for recording; great for DI in any venue that provides a decent sound system...
I ditched my tube amps five years ago. The only things I've given up are amp volumes that can't be dialed down low enough for the room, unexpected (and costly) maintenance, flaky sound and behavior, and roughly sixty pounds of stuff to carry.
On 03/13/2012 01:36 PM, Loopers-Delightfirstname.lastname@example.org wrote: