The opcodes that generate linear or exponential curves or segments are:
expon
expcurve
expseg
expsega
expsegr
gainslider
jspline
line
linseg
linsegr
logcurve
loopseg
loopsegp
lpshold
lpsholdp
rspline
scale
transeg
bpf
bpfcos
linlin
lincos
xyscale