BASS_DX8_ECHO Feedback @ 100 = No echo

[Couin]

Hi,

All is in the title.
If I set the Feedback setting to 100, there is no echo. For me, it should infinitely "echoing" the sound.
@99, it repeats for a long time, but the echo sound level decreases.

Bug or voluntary?
Thanks

[Ian @ un4seen]

Yeah, it does look like the effect's feedback parameter doesn't quite behave as documented. The effect is actually implemented by Windows/DirectSound rather than BASS on Windows, so unfortunately it can't be changed.

    https://learn.microsoft.com/en-us/previous-versions/windows/desktop/ee416835(v=vs.85)

For more predictable results, you could use the BASS_FX add-on's BASS_FX_BFX_ECHO4 effect instead.

[Couin]

Hi Ian ,

Thanks, I changed for BASS_FX_BFX_ECHO4.
I got some good result after some code adaptation.

But I don't find the goal of negative values for feedback, dry eand wet parameters. Any idea ? 

[Ian @ un4seen]

Negative feedback/dry/wet settings would mean that the corresponding signal is inverted in the output. I don't think negative dry/wet levels are very common, but negative feedback can be useful. You can try experimenting with both positive and negative settings to see/hear what the difference is.

[Couin]

Hi Ian,
I perviously tried negative value for feedback but I don't ear any difference with positive value.
What is supposed to give?


Also, another small question but I think not possible. When I change the delay, it resets the datas that was previoulsy "echoinng". Is here a way to do like analogic echo processing ? I mean, when you have sound repeating on a 0.5s delay, increasing the delay was decreasing the repeating sound playback speed. I don't know if you see what I'm talking about