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To play the virtual organ of Wirdum 1879 you need:
1st: To play the full Hauptwerk 5 version of this sampleset without restrictions you need a high-speed modern computer with e.g. Windows 10 64 bit and about 3 GB RAM installed.
The best results are possible with computers of Apple-MacIntosh. We do not have experience with the Mac.
It is very difficult to specify exactly what you need. The "mother" website hauptwerk.com gives much information about this. Prerequisites.
The virtual organ of Wirdum is available for Hauptwerk versions 4 and 5.
The next table shows the global memory requirements in a few different situations.
On other computers these values can differ!
Please note: Your Operating System also uses (much) memory.
Table showing memory requirements for version Hauptwerk 5 (space needed on you hard drive ca 1.62 GB)
Load manner Memory Requirements
Operating System not included
Full loaded 24 bit 48 kHz, uncompressed, multiloops, multirelease, noises. 2172 MB
Loaded 24 bit 48 kHz, all compressed, multiloops, multirelease, noises. 1385 MB
Loaded 24 bit 48 kHz, all compressed, single loop, single release, noises. 897 MB
Loaded 16 bit 48 kHz, uncompressed, multiloops, multirelease, noises. 1208 MB
Loaded 16 bit 48 kHz, all compressed, multiloops, multirelease, noises. 802 MB

2nd: A good internal or external sound card. Martin Dyde advices different cards. Ask your reseller if there are drivers available for your operating system.
This card makes the MIDI connection from console to computer.
3rd: A keyboard or electronic organ with MIDI output.
Also available are very beautiful consoles for "beautiful" prices. Are you a "handyman" then you can use the hardware of e.g. WIRA to expand your obsolete console with MIDI output.
4th: A very good way to listen to your favorite organ in Hauptwerk is by using headphones e.g. AKG or Sennheiser. We prefer the use of stereo equipment connected to your computer. Do not listen to Hauptwerk with a set of 10 GBP computer-speakers.!
  Hauptwerk.nl is an initiative from Sygsoft Holland. KvK 24400165. Last updated 2020-08-09