SND provides SouNDtrack management. It is designed to be cheap in terms of CPU usage.

SND:

• plays PCM sample with STe DMA
  
• manages volumes of left / right channels : the idea is to listen in mono and use them as (free) mixers
  
• manages the musical score as a DSL code (coded as a co-routine)
  
• requires / synchronizes loading of samples and transfer PCM to the wished channel
  

Volume slides are managed by VBL interrupt PCM transfers are also sliced into VBL interrupt.