Let's see...
There are three G7a torpedos available - the original one, the FAT and the LUT.
This may enable nine speed settings (3x3) - via modding. Not sure if doable.
Additionally there are four G7e torpedos - TII/TIII/FAT/LUT.
Another four speed settings (maybe more if they can be converted to 'G7a types' - via modding. If so there would be 12 more speed settings).
We have two (or 3?) Homing torpedos. If it is possible to deactivate the acoustic warhead, you'll have two/three - or if convertable to G7a types six/nine - additional speed sets.
At best you could have 30 different speed settings. But you could have only six loaded into your tubes and some 20+ into a type IX (I don't know the capacity of a type IX - never played it in the last ten years). The XXI may have even more loadout?
You would have to make all torpedos available in your timeframe. This has been done.
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