There are a few people here on the forum who have already asked for some kind of mastering tool.
I use the DuoX as the last link in the chain for streaming concerts, behind the mixing console, before it goes into digital conversion, so the setup is perhaps a little unusual.
Side 1: It starts with a reverb to add spatiality when the musicians play their instruments directly into the mixer.
At the top of the page, you can also set the main input level and the main output level.
Page 2: A parametric EQ, starting with Lowpass & Highpass filters, followed by Lowshelf and Highshelf.
Page 3+4: The respective frequency bands of the EQ with frequency, gain and bandwidth, whereby on page 3 the gain within the EQ and a post-EQ gain can be controlled separately.
Page 5: On the left a compressor, on the right the final limiter.
The available components may not replace high-end equipment with separate devices, but they offer everything you need to bring the streams to a good sound and volume level in just one small box and, above all, in a portable way.