Are there any existing opcodes (like oscili) that can lookup a set of tables 
in a mipmapped fashion?

It seems it would be a very fast way to output (pre-computed) perfectly 
bandlimited waveforms.

I can of course do this with a UDO, but was looking for something faster.  If 
there isn't,  would anyone like me to write an opcode?

Cheers,
Lilith