This gif image below shows all intervals as an abstraction, and out of tonal context:
Seeing the intervals on the Movable Do Disc places them in tonal context, just like they appear in music.
Let’s take the minor second as an example. Placing this interval in a diatonic context gives us the ascending minor seconds t-d’ and m-f, and the descending minor seconds d’-t and f-m.
With your Movable Do Disc on the Interval and Chord Attachment, you can find all intervals up to two octaves in context.
Remember that we see intervals as stepwise distances between scale degrees. This means that s,-d is a P4, s,-di an A4, and s,-ra a d5!
Although the chromatic tones di and ra have now been mentioned, the first intervals to discover are all the diatonic ones. Put each (coloured) scale tone on P1 to find out what the diatonic intervals on each tone are. Don’t forget to sing! Use this drone to use as your starting point.
In the gif image below, you can see the diatonic intervals on so. Turn on the drone on any comfortably low pitch and sing: s, l, s, t, s, d s, r s, m s, f s, s!
Diatonic intervals from so:
With the Interval and Chord Attachment underneath your Movable Do Disc, you can practice this on any tone, in any key, using solfège syllables and letter names!
Not coïncidentally, the Movable Do Disc makes it very easy to practice singing scales and modes common to Western music. In Exercises in the diatonic scale you will find an overview of the most commonly occurring scales and (sometimes several) ways to sing them in solfa.