A: 24/12 Steinberg Advent

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Day 19 - one of three copies of Absolute 3, VST instrument plug-in collection for digital music production

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

Q. Where is Steinberg based since it was founded?
A. Hamburg .... from here

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Day 20 - offer, save 30% on Dorico music scoring software

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Day 21 - Win one of five Cubasis Complete bundles - Cubasis (Cubase DAW for iPad), Classic Machines, FX Packs 1 and 2.

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

Q. What is the first sequencer that Steinberg invented on the ATARI?
A. Pro 24 .................... from https://en.wikipedia.org/wiki/Steinberg

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Day 22 - Save 25% on Yamaha Vintage sound effect plug-ins

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Day 23 - offer save 30% on Groove Agent 4, virtual drum machine and drum studio

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Day 24 - a final offer, 30% off Nuendo, audio post production for game, TV and film.