help synth envelopes

An envelope describes how a sound changes over time. An envelope can interact with different audio parameters like gain and pitch.
This is how the GridSound gain envelope looks like:

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There is 5 settings:

• 1️⃣ Attack: the time taken for the sound to rise from 0% to 100%.
• 2️⃣ Hold: the time the sound stays at 100% (by default it's 0).
• 3️⃣ Decay: the time taken for the sound to reduce from 100% to the sustain percentage.
• 4️⃣ Sustain: the percentage maintained until the key is released.
• 5️⃣ Release: the time taken for the sound to fade away, 0%.
• 🅰️ gain and pitch are two tabs you can select to switch from the gain and pitch envelopes.
  Each tab has its own toggle button to activate.

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