I had some fun using A-113 as a quadrature modulation source. Here it
is modulating an A-137, which is processing sine wave:
http://www.esnips.com/doc/c01b9441-6130-49b2-9b53-c90ab57235ef/A-
113_controlling_A-137

If there ever was A-113 Mk II it should have:
- Switch for upward saw, downward saw and rectangle. Rectangle exists
internally and would be useful as a clock divider output. Triangle
wouldn't be bad either.
- Division up to (say) 64.
- More accurate saw. (At extreme frequencies it gets quite distorted,
which might be feature of the original Trautonium unit.)
- More accurate response to incoming signal. (At low frequencies
rising saw seems better than rectangle.)
- Level knobs should affect Single Outs too.
- Less HP!

BTW, a real Trautonium sounds quite good:
http://www.esnips.com/doc/ef2ac4de-cb7d-45ad-84b9-692a4c1d1ceb/01-7-
triostücke-für-3-trautonien-(1930)---langsam

Best regards
Jari Jokinen