Just an update on volume settings. I exited DPS, then switched the ZX to headphones via its Control Panel. The volume was at 40 before I switched to headphones and was still at 40 afterwards. I restarted DPS and it set the ZX volume to 100. What I failed to notice was that DPS was set to speakers before I closed it. I tried the experiment again and set DPS to headphones before closing it again. When I restarted it, the ZX volume remained at 40.