The card comes with a 5.6 MB set of instrument patch (.PAT) files; most patches are sampled at 16-bit resolution and looped to save space.Please help improve this article by adding citations to reliable sources.Find sources: Gravis Ultrasound news newspapers books scholar JSTOR ( March 2016 ) ( Learn how and when to remove this template message ).
Samples of pianos or trumpets, for example, sound more like their real respective instruments. Gravis Ultrasound Sf2 Professional Cards AimedThey were only a little more expensive than Creative cards, undercutting many equivalent professional cards aimed at musicians by a huge margin. The Ultrasound was one of the first PC soundcards to feature 16-bit, 44.1 kHz, stereo. The final revision (v3.74) of the GUS Classic features 256 kB of onboard RAM (upgradeable to 1024 kB through DIP sockets), hardware analog mixer, and support for 16-bit recording through a separate daughterboard based on the Crystal Semiconductor CS4231 audio codec. CS4231 provides support for Windows Sound System specs, although the IO port range doesnt match the WSS hardware, and can be used for SoundBlaster emulation. Gravis Ultrasound Sf2 Software CD IncludesThe software CD includes a demo that featured 3D holographic sound through the use of software HRTF filters. Supposedly Synergy acted as the ODM-producer for it (as evidenced by their logo on the rear side of the card, although early and now very rare GUS PnP cards did not have Synergy logo). The card features 1 MB of sound ROM, no onboard RAM (although it can be expanded to 8 MB with two 30-pin SIMMs), and ATAPI CD-ROM interface. A Pro version adds 512 kB of on-board RAM required for compatibility with GUS Classic. Gravis Ultrasound Sf2 Install 16 MBIn 2014 a RAM adapter for 72-pin SIMM was produced by retro-computer enthusiasts that made it possible to install 16 MB of RAM on the Pro version without any modifications to the card. Marketed as a competitor to Wave Blaster -compatible cards, it is supposed to be installed alongside a SoundBlaster Pro16 card as a sample-based synthesis (marketed as wavetable synthesis) upgrade. This is the only Gravis soundcard with a green circuit board. It has 1 MB RAM by default, but cannot be upgraded any further. Re-labeled Altrasound as Sound M-16B and different Sound M-16C with 4x CD-ROM Interfaces. Newer C revision of InterWave - AM78C201AKC and TEA6330T fader. The chip was actually derived from the Ensoniq OTTO (ES5506) chip, a next-generation version of the music-synthesizer chip found in the Ensoniq VFX and its successors. The chip has no built-in codec, so the sounds must be downloaded to onboard RAM prior to playback. Sound compression algorithms such as IMA ADPCM are not supported, so compressed samples must be decompressed prior to loading. A CD-quality 44.1 kHz sample rate is maintainable with up to 14-voice polyphony; the sample rate progressively deteriorates until 19.2 kHz at the maximum of 32-voice polyphony. The polyphony level is software-programmable, so the programmer can choose the appropriate value to best match the application. Advanced sound effects such as reverberation and chorus are not supported in hardware. However, software simulation is possible; a basic echo effect can be simulated with additional tracks, and some trackers can program effects using additional hardware voices as accumulators.
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