Anyway, to answer the original question, directly... This "low volume" thing with Cubase is a common lament. I've also seen this in the Cubase LE that I use. I record, at what I think is a decent level, but the playback level is quite low. I found out that I really wasn't recording at the level I thought I was. I know that I want to record at an average of about -12db to -15db on the scale. What makes that difficult, is that the Cubase LE level meters, in the track view, don't have db markings next to the LED meters. Just a vertical meter that has green, yellow, and red areas. From experience, I've discovered that I want the meter to just barely bump into the yellow during the loudest parts of the recording. The meter starts to go yellow at -6db. So, if the very loudest sounds hit about -6db, then the rest of the sounds will be below that. How much below depends on the dynamics of the sounds. But, in general, the recording tends to average between -6db and -20db. And, during playback, the levels are what I expect. Later, I can always bring the levels up by using gain, or compression, or limiting.
Also, I can see the actual db numbers in the Mixer View. In the Mixer, for each channel there is a level meter. Above and below each level meter are db numbers. The number at the bottom shows the slider level. The number at the top shows the level of the signal. That's the number I want to know. To reset the top number, I reset the bottom number to (0.0). The top number will then show the db level of the loudest peak that the signal hits.