[jitter] Re: Problems with speed of patch using Expr and Matrix

One thing that hasn't been suggested is that you create one jit.expr 
object for each expression you are going to use, and then a gate to 
route the bang/matrix to the right one.  This will save you a lot of 
processing time as you aren't having to evaluate the expression string 
each time you switch.  Jit.expr should be no different from using the 
equivalent jit.op objects when working with float32 matrices (in theory). 

Andrew B.