[BUG] [Reaper] Tone Control Stability

[jatinchowdhury18]

Describe the bug
Plugin going unstable in Reaper, when using extreme settings in Tone Control. Nothing sees to reset the state except re-instantiating the plugin.

To Reproduce

1. Bypass all processors except tone
2. Put one of the tone filters at +1
3. Put the other filter in (-0.75, -1.0)
4. Put the tone frequency to > 3k
5. Output will go unstable.

Expected behavior
Plugin should not go unstable for any tone control settings. Even if it does, normal behaviour should be recoverable without re-instantiating.

Desktop (please complete the following information):

• DAW: Reaper
• Version: 2.7.0

Additional context
Reported by @mkruselj.

[jatinchowdhury18]

Fixed with #139