TOPIC:

RichB wrote:

There is no volume control from Volumio using the Volumio Qobuz.

I've just tried and for me using Volumio 1.076 there is still volume control for Qobuz. However, I'm still on the 17 December firmware so maybe this changed with the 26 January update? Or it's different for you on 1.073.

Edit: or as I wondered above it's caused by your having the Roon Bridge plugin installed or active.

qobuz volume control works for me, too, in Volumio 1.076 with december firmware.

And yes, the volume slider in the footer area is very dangerous. Did already anybody report this as an issue?

Another thing I do not like. When pressing the plus/minus volume icons below the volume circle in the now playing screen the volume is adjusted in steps of 10. This is way too much IMHO.

RichB wrote:

Concerning volume display.

If Roon or Volumio insists on a 0-100 display the volume mapping must still adhere to the .5 dB steps with a total of 255 possible volume and a maximum attenuation of -127.5 dB.

The best approach is to preserve as much resolution as possible at the moderate volume levels by mapping each % to 1 dB.

Volume Mapping 1% = 1 dB
100% 0
90% -10
80% -20
70% -30
60% -40
50% -50
40% -60
30% -70
20% -80
10% -90
1% -99
0% -127.5

The dB scale is particularly important to PEQ and other functions implemented by the SHD. Preserving direct and linear mapping to the volume % is advantageous.

Out of curiosity I just had a look at what the actual mapping is, which looks like this:



So a linear mapping of the 127.5 dB range over the 0-100 Volumio scale.

Ultrasonic wrote:

RichB wrote:

Concerning volume display.

If Roon or Volumio insists on a 0-100 display the volume mapping must still adhere to the .5 dB steps with a total of 255 possible volume and a maximum attenuation of -127.5 dB.

The best approach is to preserve as much resolution as possible at the moderate volume levels by mapping each % to 1 dB.

Volume Mapping 1% = 1 dB
100% 0
90% -10
80% -20
70% -30
60% -40
50% -50
40% -60
30% -70
20% -80
10% -90
1% -99
0% -127.5

The dB scale is particularly important to PEQ and other functions implemented by the SHD. Preserving direct and linear mapping to the volume % is advantageous.

Out of curiosity I just had a look at what the actual mapping is, which looks like this:

So a linear mapping of the 127.5 dB range over the 0-100 Volumio scale.

Any mapping must use 0.5 dB increments. I suspect volume control is happening in the DAC.
Linear mapping is not possible. This is why I recommend 1.0 dB per percent then full mute at 0,
1% is -99 dB which is beyond audibility for peak volume of real content.

- Rich

RichB wrote:

Any mapping must use 0.5 dB increments. I suspect volume control is happening in the DAC.
Linear mapping is not possible. This is why I recommend 1.0 dB per percent then full mute at 0,
1% is -99 dB which is beyond audibility for peak volume of real content.

Of course the values displayed on the SHD display are all an integer multiple of 0.5 dB but the graph shows the trend is essentially linear.

Edit: I've not tried to measure the output to see if the display is just rounding something closer to a true linear variation.

Is there a specific problem you have in mind caused by the current approach? I'd like the dynamic range to the volume control in Volumio to be reduced to something more useful, or for it to be a nonlinear mapping like conventional volume pots can be, but I don't see why steps need to be exactly identical?

RichB wrote:

I suspect volume control is happening in the DAC.

I missed this bit. No, I believe it's happening in the DSP chip (on a 32 bit scale I think).

Ultrasonic wrote:

RichB wrote:

I suspect volume control is happening in the DAC.

I missed this bit. No, I believe it's happening in the DSP chip (on a 32 bit scale I think).

The 32 bit DAC has a digital attenuator with 255 steps of 0.5dB with soft transitions so I would definitely use that.
And a 256th step for mute.

entripy wrote:

The 32 bit DAC has a digital attenuator with 255 steps of 0.5dB with soft transitions so I would definitely use that.
And a 256th step for mute.

Really? I thought the 32 bit floating point DSP chip would be the optimal place for all of the signal processing to take place? You can set gains in 0.1 dB increments in the plugin too?

Thinking about it, the SHD Studio also produces a variable output with 0.5 dB attenuation steps but obviously lacks the DAC of the SHD. My strong bet is that both units employ the same volume control implementation, on the DSP chip.

Ultrasonic wrote:

entripy wrote:

The 32 bit DAC has a digital attenuator with 255 steps of 0.5dB with soft transitions so I would definitely use that.
And a 256th step for mute.

Really? I thought the 32 bit floating point DSP chip would be the optimal place for all of the signal processing to take place? You can set gains in 0.1 dB increments in the plugin too?

True. I'm just feeling lazy I guess. User volume isn't as easy as it seems, i.e a mutiply per sample. That typically results in zipper noise so you need something like a one pole lowpass to smooth the changes and a fast update rate. So a volume control requires a continuous process that smooths any user input.

entripy wrote:

I was a bit flummoxed by the new very undiscoverable UI too. Found the main rotary volume control by clicking on the MiniDSP icon top left.

Playing around a bit I've discovered you can also get to the main playback view with the round volume control by clicking on the album cover photo at the bottom left. This gives a quicker transition for me than the reload/reconnect that happens if I click on the top-left miniDSP logo.

Agreed. If it must be positive it still should have a DB reference. 1% to 1 dB is very handy to reduce the sound and also understand the implications on power requirement. Within the SHD plugin, it is all dB as it is on the faceplate.

- Rich

This update (1.076 in my case) is worser than better for me, although there are a new fancy GUI and more coherent buttons...

But, volume ONLY is capable to up/down in 5 points of their scale which is a problem for me. My room is highly acoustic treated and relative small so every point of volume is feeled clearly and changes a lot the whole experience (i'm on bass augmented harman dirac curve)

So now i need a remote control in a mandatory way to achieve the correct volume and obviously this is a step back

Are there any workaround to get volume through cellular point by point?

finitol wrote:

But, volume ONLY is capable to up/down in 5 points of their scale which is a problem for me.

If you'd read the through the whole thread you'd have seen I made the same mistake of thinking this as you but I was helpfully corrected . If you click on the album art image in the bottom left corner of the screen you will get a view with a round volume control which will give you the same finer control as before. Just ignore the horizontal slider for volume adjustment.

Do you in android apk?
Cause i'm in and don't see nothing in bottom left zone more than bibliotheque button.
Album art image is presented greatly in rhe center of the cellular