Hello, in search of information about audio drivers i came across this discussion group. I have a specific problem and i don't know what's exactly possible, because i don't have the expertise. The situation is as follows: for an engineering project i have to write software that controls a self-made analog device. The controlled variable is the output of -let's say- a sensor which is, with the help of some electronics, connected to the sound card line-in. That signal must then be rescaled and fed back to the line-out for controlling purposes (btw. we have to use WinXP). This problem has to be solved this way, as we can't make use of a microprocessor. My question to you is now: how exactly can i get as less as latency as possible, so that the delay between input and output is minimal? I already 'studied' the WDM driver architecture and the best solution i have found so far is the directks example on this site. But i am convinced it could be even faster. I don't need any buffering as the processing must happen in real time, sample by sample: the next sample of the signal should be taken AFTER the previous one has finished processing and was already sent back to the external device. I also need an interface to a program in user mode which stores the original sample in a file. I don't need the soundcard to do anything else so I thought the best solution was to replace the vendor driver by my own, but as I don't know how i should start with that, I'm also open to other ideas. A certain latency between input and output is allowed, let's say max 5 ms. Is this possible and if so, what is the best way to approach this problem? Any suggestions are welcome. Anyway thank you for your time, I really appreciate it. with kind regards, Pieterjan Demarcke ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/