Hi,
first of all: thanks for ordering
both your ideas are good and will work. I do know of some people who have used it this way and they are happy with the results.
about power; it says on the site: “Runs off a single supply voltage between +15 and +25V, generates negative voltage internally” – can i add something to adapt it to run on euro +/-12V?
Not that easily. You’d have to remove a SMD part on the unipulse board and solder a wire to a pad on the board. If you believe you can do that I can provide further infos. Unfortunately your order is already shipped..