atmos.cat virtual instruments - Summary

· Project purpose

To offer functional, accessible and musically valid versions of historical or unique instruments, playable directly in a web browser. The project prioritizes sound preservation, education and open access.

· Differences from conventional samplers

· Strategies by instrument type

· Large instruments

Such as the Sant Just i Pastor organ:

• Only C1, C2, C3... notes are sampled
• Other notes are generated using midi2rate
• Several historical temperaments are offered to enrich the result
• Full sample sets are available on the server
• There is also a full version presented

· Damaged or incomplete instruments

Such as the harmonium and celesta:

• The original instruments were in poor condition
• Only the playable notes were recorded
• Missing notes were extrapolated from nearby ones
• All source material is available with full transparency

· Small and complete instruments

Such as the Ghent carillon, the claviorgan or other museum instruments:

• All actual samples are used
• No interpolation needed
• Fully functional within a browser

· Special case: Organ of Sants Just i Pastor

• Largest instrument: 1632 pipes individually sampled
• Multiple temperaments and tunings
• Convolution reverb
• Requires a powerful computer with plenty of resources

· Transparency and access

• All original recordings are available on the server
• Simplified virtual instruments are fully functional but never misleading
• The project defends honesty, knowledge, and freedom of access

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