Those settings will depend on your sound card and its driver. Also, faster sampling and larger bit-rates are not always better. If you have a sound card or chip on your MOBO or in your GPU, it might not have the quality to make the higher numbers you are seeking sound better. they can introduce sampling artifacts and things. The best sounding sample bit depth is one and that is generally 2.8 Mhz or 5.6 MHz, even higher. It is called bitstream. It will actually make a PCM file sound better when converted. the problem with bitstream is that they haven't really figured out a good way to edit it. So, either it is a PCM wave converted or a live recording. Many Professional cards are still using 96 kHz and 192 kHz and a 24 or 32-bit depth. As far as what is shown in the drop-down menu goes, that depends on your hardware and its driver. I use MOTU I/O for sound. They have Burr-Brown 96kHz 24/32 bit DA and AD convertors with a proprietary PCIe firewire-based card. they sound better than any prosumer card or motherboard Realtek chip that shows 32-bit 512kHz PCM AD/DA conversion in the menu. They can tend to be noisy and inaccurate, especially at their higher speeds. I believe the best sound on disk right now is 96,000khz with 24-bit PCM or bitstream. There are effects, editing, and producing software that does their thing at a bit-depth of 64 and high sample speeds, but for DA/AD convertors 96 -192k and 24 - 32 bits are the industry standard. PCM oversampling doesn't add anything good, only bitstream conversion can improve the sound.