Cannot replicate the save game issue on Castlevania, or even Mario Kart, and other DS content. You can try running the “Restore DraStic Configuration” within the Task Toolkit.
As for the “buzzing” sound, I cannot replicate that either. Zero changes were made regarding this issue, and if it were a wide-spread issue we would have heard more about it.
Please see, Speaker humm - #4 by xonglebongle (Perhaps get checked for tinnitus?)
Tested Devices:
- RG34SP (both 1GB and 2GB models)
- RG34H
- RG35H
- RG40V
- Brick