The opcodes that generate linear or exponential curves or segments are:
bpf
bpfcos
cosseg
cossegb
cossegr
expon
expcurve
expseg
expsega
expsegb
expsegba
expsegr
gainslider
jspline
line
linlin
lincos
linseg
linsegb
linsegr
logcurve
loopseg
loopsegp
looptseg
loopxseg
lpshold
lpsholdp
rspline
scale
scale2
transeg
transegb
transegr
trigexpseg
triglinseg
xyscale