Can anyone help me to better understand sampling with an ART Dio. I've just bought one and, when I use it as a DAC hooked up to a cd player, there appears to be the option to select the sampling rate for use with an internal clock or to use the external clock in the player. Using a button I can cycle through the various options. According to ART's advice, I must use the setting for external clock, as other settings are really relevant to use of this gadget as an ADC. But, when I manually select the options, it plays back fine with 44.1 and 88.2khz, but with 48 and 96kHz, it plays back with crackling from one (but not both of the channels). This seems to be consistent with ART's advice, but I've got a few questions and wondered if anyone here can help: 1. If I can use the ART's internal clock rather than that of my player, is this preferable, or is it just down to listen and see which I prefer? 2. Why would ART say that, when hooked up to a cd player, the setting for external clock must be used when some of the manual settings with the internal clock work just fine. 3. I thought the DAC would upsample up to 96kHz, but have I got it wrong that such a DAC will do this and will it only cope up to 88kHz? This is particularly of interest as when I've tried 96kHz, while there is the crackling on one channel, the immediate impression is of a little more clarity and vibrancy. Had the DAC for a day and, so far, I've been impressed with the quality. Thought it would take a long hard running in, but it sounded reasonable out of the box, contrary to some things I've seen written about it on the Net. If it gets better with longer running in, I'll be well pleased. Thanks guys