Any references to brands and instruments, are provided for description purposes only. We do not have (nor do we claim) any association with or endorsement by these brands. ¹ As the service is fully automated, in order to protect the instrument, several security tests are performed on the submitted files. It is possible that a MIDI file that does not pass our various tests is quite acceptable. In this case, human verification may be necessary. To do so, please write to us and we will gladly validate the file in question. ² The preview function (of approximately 10 seconds) only gives you a basic idea of the result, with the sole purpose of facilitating adjustment of the various parameters. Note that the first channel (channel 1) is considered by default as being "piano", regardless of the track and the number of tracks involved. That way, you can have multiple tracks (right hand and left hand, for instance) that will be played together. ³ Subject to change without notice.