Use an audio plugin like azimers audio v 0.13 and use at the multimedia screen (at my computer/configuratiescherm (I don't know the english name because I am dutch) and choose at multimedia none.
I am using version 0.8.5 and all the plugins that haven't worked are zimars, jabos direct sound1.4, BasicAudioPlugin 2.0 for 1964 and Azimers Audio v0.30 (old Driver).
Try defragmenting and use different settings on your video resolution... A good setup to test is
Video:
Jabo's D3d7 1.40
In Window mode: 320x240
Frame buffer type: Double buffer flip (fiddle until the video is smooth at 57-60 VI/s)
Audio:
Azimer's v0.30
Buffer size: 4 points less (change this until u can hardly hear the skipping) <- this depends heavly on your video's refresh rate, if the video cant refresh as fast as the audio. Then your game's sound will skip.
This is what i configurated on my computer, that is running at 800x600. I only got into N64 Emulators 2 days ago, so correct me if im wrong.
System specs:
Athlon XP 1700
256MB SDRAM (Recommanded DDR)
60GB HD
Geforce 2 MX 400
I'm on a duron 800, 256mb SDRAM, and a geforce4 ti4200. I find it impossible to run PD smoothly. PJ64 gets about 30fps, and 1964 gets about 50fps. Playable, but the sound is really bad.