TR 606 / TR 909 Tuning
                     
                     
 
                    
 
                                   
                                    
 
Roland TR 909 Tuning
                      
  
Roland TR 909 - Extended Bass Drum Decay 30ms → 120ms
Connect the following items in parallel to the present resistors or capacitors - at your own risk:
1μF-C8/9   560Ω-R21   6,2kΩ-R57

Roland TR 909: Pitch Control, Drive Control, Tune Depth, Hi-Hat Tune
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