For those using sip & puff, does anyone else use a Darci USB plug-in? I've been happily typing & using a mouse with one for years now, but it only works at 100% with Windows XP. I've been running one computer with XP solely for that reason, but since Microsoft phased it out it's becoming increasingly problematic. When we try to use Darci with Windows 7 or 10 there's a significant lag between the sip & puff command and the desired action. Typing is notably slower. Darci says it's a Microsoft issue and Microsoft is totally useless help-wise and says to contact Darci. I know it's not widely used, but I thought I'd ask anyway. Thanks!