In dolphin it wont load my custom music it just loads the normal when and its like glitchy and scratchy and sounds very poor is there a way to fix this.
Also is it possible to use 4gb sdhc with dolphin yet
Are you using File Patch Code v3.5.1b (and not any other version of the file patch code)?
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If you are and the problem persists you may be encountering the read errors I mentioned when using more than 1.95GB of SD data with Dolphin (https://bugs.dolphin-emu.org/issues/8823).
The best way to get SDHC support in Dolphin is to draw attention to the above issue on the Dolphin emulator forums (https://forums.dolphin-emu.org/). I want SDHC support too but developers must have interest in adding it.
Update: We now have SDHC support! (https://bugs.dolphin-emu.org/issues/8823)