The IgniteTV remote control doesn't limit the amount of volume you get on any device, it only sends an "up" or "down" (or mute) signal. Try going to Rogers - Settings - Device Settings - Audio - HDMI Audio Output and select "Stereo" instead of Auto or Expert.
I assume you're connected directly from the Ignite box to the TV via HDMI. Also check your TV's audio settings to make sure you haven't invoked some sort of special setting like "midnight mode" or something similar which may limit the amount of volume that the TV can put out.
I'm assuming you didn't have this issue before? What were you using before you had IgniteTV and how were you connected?
1. Can you temporarily hook up a DVD/BD player or something else via HDMI to the same input used by the IgniteTV box to check to see if the TV is the problem?
2. Do you utilize any TV apps like Netflix and do you have the low volume issue with them?
3. Unplug and replug the HDMI cable at both ends a few times to ensure you have a good electrical connection.