Silka and Insolidus are one of the same choir with Silka expanding on the Insolidus's foundation. Both choirs are recorded using the same singers in the same hall and use the same microphone positions. This means they are designed to work together or they can operate independently as stand-alone choirs.
Silka being a very large expansion to Insolidus, offering more expansions on complex Arcs such as 2, 4, and 5 syllables, as well as adds a rhythmic section including Repeated Staccato Phrases both in Straight and Triplet timings. Insolidus offers Syllable Arcs in 2, 3, and 4 syllables in both 4/4 and in 3/4 time, A wealth of velocity-based short notes, and Tonal Yells.