[GH-ISSUE #396] Default index ratio increased again in latest release - negatively impacting performance for little to no gain? #196

New issue

Open

opened 2026-10-20 09:56:34 +00:00 by bsakaguchi · 3 comments

bsakaguchi commented

2026-10-20 09:56:34 +00:00

Owner

Originally created by @kalomaze on GitHub (May 30, 2023).
Original GitHub issue: https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI/issues/396

I noticed that the default value seems to have changed again. I would like to know the reasoning because despite messing with the other option for voiceless consonant and crepe with median filter, it seems to still underperform compared to the old default value. 0.75 is probably a good default to stick with, or maybe a sweetspot of 0.7, considering how much the nearly maxed out index seems to cause raspy sounds, and how little the index really helps when it comes to accuracy (not much)
QuickExample.zip

Originally created by @kalomaze on GitHub (May 30, 2023). Original GitHub issue: https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI/issues/396 <img width="256" alt="image" src="https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI/assets/66376113/6b219e5e-5b63-4e10-95db-539c9c67b851"> I noticed that the default value seems to have changed again. I would like to know the reasoning because despite messing with the other option for voiceless consonant and crepe with median filter, it seems to still underperform compared to the old default value. 0.75 is probably a good default to stick with, or maybe a sweetspot of 0.7, considering how much the nearly maxed out index seems to cause raspy sounds, and how little the index really helps when it comes to accuracy (not much) [QuickExample.zip](https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI/files/11605130/QuickExample.zip)

bsakaguchi added the

documentation

label

2026-10-20 09:56:34 +00:00

bsakaguchi commented

2026-10-20 09:56:35 +00:00

Author

Owner

@RVC-Boss commented on GitHub (May 31, 2023):

This problem only exists when the training set is limited and the quality is average. The answer to this question depends on whether you care more about timbre similarity or sound quality.

@RVC-Boss commented on GitHub (May 31, 2023): This problem only exists when the training set is limited and the quality is average. The answer to this question depends on whether you care more about timbre similarity or sound quality.

bsakaguchi commented

2026-10-20 09:56:35 +00:00

Author

Owner

@kalomaze commented on GitHub (May 31, 2023):

This model was trained on studio quality acapellas, using v2. No UVR was used whatsoever. On top of that, it was using ~30 minutes worth of data, all of the same studio quality. Unless the index is meant to be turned up only for very large model datasets (hours worth? It confuses me since '10 minutes' is the recommendation given on this repository for a quality model and this is over 3 times that, with no lossy AI isolation involved).

Quality in spek (spectral analysis tool):

0_gt_wavs.zip
A sample of the preprocessed wavs before feature extraction to demonstrate how it sounds.

The model, when used at a proper index rate, is a very high quality model.

@kalomaze commented on GitHub (May 31, 2023): This model was trained on studio quality acapellas, using v2. No UVR was used whatsoever. On top of that, it was using ~30 minutes worth of data, all of the same studio quality. Unless the index is meant to be turned up only for very large model datasets (hours worth? It confuses me since '10 minutes' is the recommendation given on this repository for a quality model and this is over 3 times that, with no lossy AI isolation involved). Quality in spek (spectral analysis tool): ![Quality in spek](https://cdn.discordapp.com/attachments/1089076875999072302/1113573706350993408/image.png) [0_gt_wavs.zip](https://github.com/RVC-Project/Retrieval-based-Voice-Conversion-WebUI/files/11618806/0_gt_wavs.zip) A sample of the preprocessed wavs before feature extraction to demonstrate how it sounds. [The model, when used at a proper index rate, is a very high quality model.](https://cdn.discordapp.com/attachments/1089076875999072302/1113575159316623360/16_Kendrick_80epochs.mp3)

bsakaguchi commented

2026-10-20 09:56:36 +00:00

Author

Owner

@RVC-Boss commented on GitHub (Jun 1, 2023):

I will use your gt and have a try

@RVC-Boss commented on GitHub (Jun 1, 2023): I will use your gt and have a try