In the Instruments tab, you can "scale the keys" of a select instrument from the base note C4. This changes the rate at which notes go up or down in pitch from the base note.

In this example, I use an instrument that scales by 0.2x the original rate.

<p><iframe width="100%" height="180" src="https://embed.notessimo.net/?oembed=1&url=https%3A%2F%2Fnotessimo.net%2Fs%2F77846" frameborder="0" scrolling="no" seamless="seamless" sandbox="allow-same-origin allow-scripts allow-forms allow-popups allow-popups-to-escape-sandbox allow-presentation"></iframe></p>\n<p>In the Instruments tab, you can “scale the keys” of a select instrument from the base note C4. This changes the rate at which notes go up or down in pitch from the base note.</p>\n<p>In this example, I use an instrument that scales by 0.2x the original rate.</p>

Scaling instruments in Notessimo