Distinguish between actual flip flops and software variables

[jotego]

It seems that variables in the opm_t structure are registers in the original design, but some of them are not.

One such example is lfo_out2_b. This variable is stored in function OPM_DoLFOMult and accessed in function OPM_DoLFO1. Both functions are called one after the other in the same clock cycle. Thus lfo_out2_b is actually a way to transfer a variable from one function to the other within the same clock cycle. This is confusing as most members of the opm_t structure seem to represent registers.

Maybe a suffix for this kind of software variables would be advisable. Maybe _soft or _wire would be good.