I would like to understand why if i express this function that way it works fine 

(gen-filter-change (vector-to-pitch '(g4 g5) (gen-white-noise 64 :seed 246))
 (vector-to-length 's 1 5 (gen-white-noise 32 :seed 456))
 (vector-to-velocity 'mp 'ff (gen-white-noise 122 )))

and if i do that 

(gen-filter-change '(gs4 e4 e4 d4 e4 gs4 d4 c4 fs4 gs4 e4 e4 c4 e4 gs4 d4 gs4 fs4 fs4 d4)
                   '(1/16 1/2 1/4 1/4) '(s e s s e)
                   '(mf mf mp ff mf mf mp mf ff mf mf f f mf mf mp ff mf f mp ff ff f
                     mp ff f f mp mf mp f ff f mf mf mf ff mf mp f ff f mf mp f f mf
                     ff f f mf f mp mf f ff f mp mf mf f ff f mf mp f mf mf mf mf mf
                     mf f mf mf f f ff mf f mf f mp f mf f mp f mf mf f mp mp mf mf mf
                     mf f ff f mf mp mp mf mf mf f mp f f f f f f f mf f mf mp mp f mp))

It doesn't work , why can't we enter velocities manually?

 

Thanks

Hi,

it is important to check the parameters we give to the function.

GEN-FILTER-CHANGE need pitch, length and velocity  but you give it two length list.

This is the cause of the problem.

SB.