SoundManager VST Host does not include a built‑in audio player. However, you can load a sample player plugin and play your audio files from there. For example, the TX16Wx Software Sampler allows you to play audio files. Make sure that in TX16Wx, under the Groups section, the mode is set to Toggle, and assign the audio file to any key on your MIDI controller. This way, you can easily start and stop the sample. Of course, this also works with any other sample players from other manufacturers.