Presets do not work 10Hz or less apart

[hackerb9]

I created bookmarks for 30 and 40 Hz. I expected that I could use the left and right arrows to move between them, the same as with any other bookmark. Left arrow works. However, when I am at 30, the right arrow does nothing and the frequency stays at 30.

Likewise, with a bookmark at 25 Hz, I cannot use the right arrow to go from 25 to 30 Hz.

The problem does not occur for bookmarks over 10 Hz apart. (For example, 29.99 to 40 Hz).

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Thank you for this extremely handy tool! Just the other day I found a new use for it: teaching a young nephling the difference between audio waveforms.