the older revision of teletype (green PCB) might also be able to provide sufficient power as long as you don’t have too many LEDs on at the same time. and even if you do exceed what teletype can provide, it will just shut down, no damage to the module, you can just power cycle.
the 2nd aspect is making sure you have enough power in your eurorack case - you have to do this regardless of which version of teletype you use (or if you use 2 > 1 and power it from your euro power).
you need to have a 2 device to 1 host switch which are less common.
you can do that already with the grid control mode, as mentioned. you can directly change variable and pattern values with it: https://github.com/scanner-darkly/teletype/wiki/GRID-CONTROL-MODE#live-page-with-variables
it’s also super simple to make a script that would let you use grid to control a variable. for instance:
#I
G.FDR 0 0 0 16 1 0 4 1
#1
A G.FDRN
this script will create a single row fader. as you can see, with grid scripts the difficult part is defining buttons and faders, but there are multiple ops that simplify using them after that - a script gets called when a grid button is pressed or a fader value changed, you do something in the script or read the fader value etc etc.
also take a look at this: https://github.com/scanner-darkly/teletype/wiki/STARTING-SIMPLE
relatively easy. take a look at this study: https://github.com/scanner-darkly/teletype/wiki/TRIGGER-SEQUENCER
well, let’s count: for other units we have whitewhale, earthsea, meadowphysics, kria, orca, orca’s heart, polyearthsea, chrono sage, levels, cycles. for teletype we have: https://github.com/scanner-darkly/teletype/wiki/CODE-EXCHANGE - i didn’t count, but there are many great scripts there. granted, they might be not as complex as kria - but that’s why kria is a dedicated firmware. and the strength of using teletype scripts to create your own grid apps is that you don’t need to install a separate toolchain, you get all the other things teletype supports, you can have 32 different apps etc etc.
this is related to the question of complexity of creating a grid teletype script - i would say they are less suitable for experimentation (creating a script from scratch) and more fit for creating something you won’t change often, like your own custom controller. many scripts in the code exchange page i linked can be used as is (and i need to find the time to create a pack of best grid teletype scripts with proper descriptions etc - and the time to review/add more studies).
