Dave Smith Instruments SYNTHESIZERS

Hi gang.  Long time lurker here.  I have a quick question.  Are 
there any programs that let you create single-cycle waveforms by 
drawing them in with a mouse?  Would like to have a program that I 
could use for wave generation purposes for both the Evol as well as 
my microwave XT.  Can't seem to find any thing with this simple 
feature.  Just wanna draw waveforms and load them into my machines.  
Looking for PC really, but mac will do too.

John