A: 24/12 Steinberg Advent

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Day 9 - an offer
Save 25% on a UR22MkII recording pack

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Day 10 - Win 0ne of 5 Halion 6 (sampling/sound design software)

https://www.steinberg.net/en/promotion/festive_countdown_2017.html

Q. Who invented ASIO?
A. Steinberg

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Day 11 - offer
Save 50% on VST sound instrument plug-ins, for Padshop. Granular guitar, granular symphonies and zero gravity.

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Day 12 - an offer
25% off the UR22MkII usb audio interface

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Day 13 - Win one of 10 Cubase branded merchandising packages, including mousepad, cap, mug and bag.

https://www.steinberg.net/en/promotion/festive_countdown_2017.html

Q. What is the first name of Mr. Steinberg (one of Steinberg's co-founders)?
A. Charlie from here

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Day 14 - offer, save 50% on Halion piano and orchestral sims

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Day 15 - another offer. Save 25% on UR242 and UR44 audio interfaces.

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Day 16 - offer, 25% off Wavelab Elements 9.5

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Day 17 - One of five Cubase Pro 9.5

https://www.steinberg.net/en/promotion/festive_countdown_2017.html

Q. What is the former name of Steinberg’s famous software, Cubase?
A. Cubit
from here

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Day 18 - offer, save 25% on WaveLab Pro 9.5