Understanding, Describing, and Discussing Timbre

[Little John]

7 hours ago, Richard Mellish said:

one might expect the flow to start and stop more suddenly as the reed occludes or ceases to occlude the slot.

 

I can only assume that the first "partial" stop (50ml/s at 1ms) is when the reed is passing into the frame (so the reed and the airflow are in the same direction and therefore the airflow isn't reduced entirely to zero); whereas the total stop (0ml/s at 2ms) is when the reed it coming out of the frame (so the movement is opposing the airflow and hence the stop is complete). The smaller hump (at 70ml/s) is halfway between these which would correspond to the maximum deflection of the reed within the frame and hence maximum airflow (in that half of the cycle); after that dropping as the reed movement reverses and opposes the airflow.