Samsung HT-P1200 - no central unit - volume control

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Hi All,

That's my first post here.

Short introduction to this system:
1. DVD player - all inputs are here (hdmi etc.) - I do NOT have it.
2. 5 speakers - connected to Subwoofer
3. Subwoofer (built-in amp for all speakers)

Additionally I have 5.1 D/A converter - optical to 6 analog channels.
As you can see it's possible to connect those analog inputs directly to subwoofer amp and system works, speakers play.

BUT - it's pretty silent. I tried to connect MP3 player as analog input, and with maximum volume on it, loudness is just acceptable.

Question:
How can I add volume control to this system?
- I have all schematics diagrams
- I tried to use impulse knob to connect it to VOL+/- (see picture) with no effect.
 

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