Installation of SampleTank instruments (Windows/MacOS) Just browse your system, locate your SampleTank Instruments folder and copy (or drag&drop) all the instruments you want to add; the added instruments will be automatically selectable. This is a very easy and fast way to load sounds. IMPORTANT: a SampleTank Instrument is made of three essential files: - .sth containing the instrument name and description - .sti containing the instrument program - .stw containing the instrument waveforms They should be moved together or the instrument will not work correctly.