Anyone using a USB DSD DAC?

I assume they are using custom drivers? Standard USB Audio would entail converting the DSD to PCM, then back to DSD, which defeats the purpose.

The ElectrArt has 2 modes, a usb 1.0 generic driver mode, that works on os x and windows 24bit/96khz without dsd support, and USB 2.0 asynchronous mode, with a proprietary driver that only supports DSD 2.8mhz and 5.6mhz on windows so far. Playback and recording also only with proprietary very basic software, with no English documentation.

I have received the last part I needed, the Buffalo-II DAC. After wiring up all power supplies and boards I got DSD playback working. another hour figuring out jumper settings and I got recording working. Testa so far are preliminary, with only a few records and some radio recorded. I am impressed so far with the sound quality, the buffalo-II certifiably blows away my previous DAC even with 16/44.1 cd's.

The DIY part of my project is just starting, but this proof of concept is working. I am excited to have access to this format on my computers, arguments aside about dsd/pcm debates....
I am planning a few custom analog stages, both for the DAC and ADC. First tests with the buffalo are with the Legato I/V stage, impressed so far.

My plans are to experiment with other discrete class a stages and definitely going to try SET tubes at some point, maybe some 2a3 single plates....

On the digital side adding SDIF-3 I/O, possibly also DSD over optical cable via the meitner spec. Modding a sacd player with SDIF-3 is also on the horizon. I am a firm believer we need real standards here for greater acceptance of the format, many people want a pure connection for feeding DSD to there DAC without downsampling, but the only options now are VERY expensive. (ie. boutique audiophile or high end professional gear) SDIF-3 is found on more gear AFAIK (Neve DSD ADC, Tascam dsd recorders, DAD, Prism, Meitner.) Also looking into a method of sending DSD over HDMI, probably not ever for compatibility with modern recievers or other DAC's, but only for a high quality cable...

If anyone else wants to follow in my footsteps all the parts are available to anyone, and there are many options for ADC and DAC, depending on whether dsd 128fs is needed. the AKM chips are very interesting, but i could only find ones suporting 64fs, and I wanted 128fs for my first tests.
If you have the cash the ESS9018 Evaluation Kit is $666 with powersupply and I/V stage, not sure if it sounds better than a Buffalo-II, but it is a plug and play solution for those not wanting to build a buffalo kit and all of its associated powersupplies/analog boards. The ADC was a evaluation kit ordered from TI, chosen because it's internal logic is 1-bit DSD, making the dsd files very much like a "raw" format. The pcm 4222 has better specifications, but is internally 5-bit Delta sigma, though it is possible to capture that 5-bit delta sigma signal for custom mathematical models, which I believe is what DAD is doing....

there is both 5bit AND 6bit delta sigma output on the pcm4222

Novice question about DSD. I have several DSD Disks, and a few DVD-Audio High Resolution Multi-Channel MLP Disks. I have even heard same Dianna Krall releases on both, DVD-Audio MLP Downmixed wins hands down. It sounds more like Analog, it has a much wider/deeper Soundstage, way more decay in the HF, and I would say sounds about 90% as good as a Record. Concidering Blue-Ray Audio is on the horizon,
is it wise to invest alot of money in a DSD Format that will soon be 2 Generations behind? Especially since many are currently using DVD Audio Extractor to Rip Multi-Channel High Resolution DVD-Audio MLP to their Hard Drives.
If Blue-Ray Audio ever takes off, DSD is going to end up a
Dinosaur Format. Should anyone be investing tons of their
hard earned money into it now?

Well, the source/quality of a lot of DSD material is heavily debated, whether up-sampled from 16/44.1 at the worst, or simply made without proper considerations. I really can't say (personally) one way or the other is superior, as I haven't tested them side by side using real high end converters with all other variables controlled, and there are MANY variables. Honestly I think fair comparison is hard to come by. I am always open to try out new gear...
Also for those who have invested in DSD materials, having the option of using high quality DAC's is a fair use right of the consumer, why buy the same record as vinyl, than tape, than cd, than sacd, than bluray, enough already, we should work to improve the formats we have, they ALL are capable of at least decent quality paired with a well built converter/analog stage