[˵]
2ֱ/߱ʽ

[ú]
abs(ֵ)ؾֵ
sin()λΪ
cos()
tan()
log(ֵ)
exp(ֵ)
sqrt(ֵ)ƽ
squ(ֵ)
tri(ֵ)ǲ
saw(ֵ)ݲ

squ, tri, saw Ϊ1ֵΪ -1 ~ +1 

[Ԥ]
pi: 
rnd: 01ֵС
xf: x λãֵΪ 0.0 ~ 1.0
x: ǰ x ֵ
x1:  x (tick)
x2: յ x (tick)
y1:  y
y2: յ y
oy: ǰֵ Control Change
res: ȣ߼
ymin: y ֵɲõСֵ
ymax: y ֵɲõֵ
tempo: ǰٶֵ

[ʾ]
ֱߵĵʽ
y1 + xf * (y2 - y1)

 xf ֵ0𽥱Ϊ1y ֵ y1 Ϊ y2

