The Kontakt version of Adam Monroe's Upright Piano is cross-platform, and is maintained by Native Instruments, all the programming and effects being done through them. Some simple scripting is done by us. The Kontakt version requires the FULL version of Kontakt 5 or later. You can use the (free) player version to "demo" the instrument, but it will time-out after 15 minutes. The VST version is another beast entirely, and the programming falls entirely on AdamMonroeMusic. Our goal in any sample library that is also a VSTi (virtual instrument) is to attempt to match the performance of the Kontakt Player. With this library, we feel like we have done just that.
The VST version includes updated, high-performance algorithms that have been improving with each new virtual instrument released by Adam Monroe Music. For example, the buffering algorithm is double-buffered and multithreaded, which means that buffering performance is fast, even on slower computers, and even in lower latencies. Voices are held and iterated over in a pure, C-Style array. Memory use is comparable to the Kontakt version (about 400MB). Because of the solid VST code base, you can feel confident that the VST version should
work just as well as the Kontakt version. The VST version currently works with all Windows VST compatiable DAWS.
Why develop a VST at all? Although a great piece of software, the Full version of Kontakt (required to run 3rd party sample libraries) is expensive. Developing a VST version that anyone can use does not add significant time to the development of an Upright Piano library - most of the time is spent sampling and processing the samples - so it's a real no-brainer.
Audio engineering is a large part of creating a VST, but the sounds of this upright piano have barely been processed. Slight eq tweaks were done here and there done in order to balance-out the microphone positions. The samples were de-noised.