Bassdrum ENV2 peak voltages

• EchoBoy

  Posts 29

  Joined: May 8th, '14, 11:54

  Jun 22nd, '17, 21:53

  I am currently tuning my Nava and noticed surprising peak voltages of the ENV2 of the Bassdrum.
  
  I would have expected that without accent, the peak voltage would have been half of with accent.
  
  It is not: at R41, I observe 9V without accent, 12V with accent on my Nava
  With the same probe, same oscilloscope, I observe 2.1V without accent, 4.8V with accent on a TR909 I borrowed (which has issues).
  
  What should be the peak voltages of ENV2 with and without accent?
  
  In the picture below:
  - upper window: Nava, 1st&3rd peak is without accent, 2nd peak is with accent
  - lower window: TR909, 1st&3rd peak is with accent, 2nd peak is without accent
  

  • Quote

EchoBoy

Posts 29

Joined: May 8th, '14, 11:54

Jul 16th, '17, 18:33

Here is a comparison between a TR909 (in red) and the Nava (in blue) with a pattern alternating with accent and without accent, played quickly:

ENV2 :

This graph has been taken in AC mode. In DC mode the oscilloscope shows the same ratios without accent vs with accent:
- 1/2 for the TR909
- 2/3 for the Nava with firmware 1.023.

The issue actually comes from the level driven by the DAC when the instrument is played with accent.
A firmware update with the same ratios as the TR909 (or a way to control the ratios for each instrument) would be welcome.

Last edited by EchoBoy on Jul 19th, '17, 22:10, edited 3 times in total.

• Quote