I have been using dBPoweramp R14 music converter for many years. I recently replaced my PC with a new laptop and decided it was time to update dBP to the latest version. So I now have dBP 2025-07-01 64 bit on Windows 11. The first time I have tried to use this to process some music files I am getting badly distorted (unlistenable) output files. They are playable but consist of loud noise. Looking at the waveform in Audacity they contain square waves between 0 and -1 (i.e. no waveform positive above zero) - see screenshot below. The file sizes are also not correct (much smaller) based on comparing to previous output files that are ok.

The operation I am doing is to convert 6 channel FLAC files to 2 channel FLAC files using these DSP Effects:
I have done that many times in the past using dBP R14 without any issues.
From playing around with this to try to find the cause, I don't think the Channel Mapper is significant, it seems to be an interaction between the 32 bit float Bit Depth and the Volume Normalize.
If I do this, the output file is OK:
1. Bit Depth - 32 bit float
2. Bit Depth - 24 bit fixed
If I then add a volume normalize step in the middle of that, I get distorted incorrect output file:
1. Bit Depth - 32 bit float
2. Volume Normalize - Fixed Amplification -5dB
3. Bit Depth - 24 bit fixed
If I then change the first step from 32 bit float to 32 bit fixed and leave steps 2 and 3 unchanged, the output file is OK:
1. Bit Depth - 32 bit fixed
2. Volume Normalize - Fixed Amplification -5dB
3. Bit Depth - 24 bit fixed
Please help!
I have captured the debug log file from one of the runs where it produces the distorted output file. I don't see any error messages or anything that looks wrong in the log file.
The operation I am doing is to convert 6 channel FLAC files to 2 channel FLAC files using these DSP Effects:
Bit Depth: -depth="32 float"
Channel Mapper: -channels="2" -ch1="1,-3,3,-6,4,-3,5,-3" -ch2="2,-3,3,-6,4,-3,6,-3"
Volume Normalize (non-live): -mode="fixed" -maxamp="8" -desiredb="0" -adapt_wnd="6000" -fixed="-5" -eburefdb="-18"
Bit Depth: -depth="24"
Channel Mapper: -channels="2" -ch1="1,-3,3,-6,4,-3,5,-3" -ch2="2,-3,3,-6,4,-3,6,-3"
Volume Normalize (non-live): -mode="fixed" -maxamp="8" -desiredb="0" -adapt_wnd="6000" -fixed="-5" -eburefdb="-18"
Bit Depth: -depth="24"
I have done that many times in the past using dBP R14 without any issues.
From playing around with this to try to find the cause, I don't think the Channel Mapper is significant, it seems to be an interaction between the 32 bit float Bit Depth and the Volume Normalize.
If I do this, the output file is OK:
1. Bit Depth - 32 bit float
2. Bit Depth - 24 bit fixed
If I then add a volume normalize step in the middle of that, I get distorted incorrect output file:
1. Bit Depth - 32 bit float
2. Volume Normalize - Fixed Amplification -5dB
3. Bit Depth - 24 bit fixed
If I then change the first step from 32 bit float to 32 bit fixed and leave steps 2 and 3 unchanged, the output file is OK:
1. Bit Depth - 32 bit fixed
2. Volume Normalize - Fixed Amplification -5dB
3. Bit Depth - 24 bit fixed
Please help!
I have captured the debug log file from one of the runs where it produces the distorted output file. I don't see any error messages or anything that looks wrong in the log file.
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