Add Preset Save & Load Functionality

[mohitvermax]

📝 Description

Implement a preset system that allows users to save the current synthesizer configuration (waveform, octave, ADSR envelope, EQ, etc.) into a file and load it later to restore the same state.
This will make it easier for users to store and reuse their favorite sound settings across sessions.

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✅ Tasks

1. State Serialization

• Gather all current state values (waveform, octave, ADSR parameters, EQ, etc.).
• Convert them into a structured JSON format.

2. Export Functionality

• Add a “💾 Save Preset” button.
• When clicked, trigger a .json file download of the current state.
• Include timestamp or custom naming (e.g., preset_2025-10-06.json).

3. Import Functionality

• Add a “📂 Load Preset” button at the top of the page.
• Allow users to upload a .json file.
• Parse and restore all synth settings and UI states (knobs, dropdowns, EQ sliders, etc.).

4. UI Feedback & Validation

• Show toast or alert confirming successful save/load.
• Handle invalid or corrupted files gracefully with user-friendly errors.

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🎯 Expected Outcome

• Users can export their synth configuration into a local .json file.
• Users can import this file to instantly restore all synth parameters.
• All UI elements (knobs, sliders, dropdowns) update visually.
• Feature feels smooth, responsive, and non-destructive to the session.

[devanshu-puri]

hello @mohitvermax , i would like to contribute to this task can you assign me .
thank you

[mohitvermax]

hello @devanshu-puri , I would first recommend you to go through the code and let me know your approach for the task.

[devanshu-puri]

1. State Serialization
   Collect all current synthesizer parameters such as:
   Waveform type
   Octave
   ADSR (Attack, Decay, Sustain, Release)
   EQ (Bass, Mid, Treble)
   Any other UI-controlled parameters
   Store these values in a single JS object (e.g. synthState).
   Use JSON.stringify(synthState) to prepare it for export.

2. Save Preset (Export)
   Add Save Preset button in the UI.
   On click:
   Convert synthState to JSON.
   Create a Blob and trigger a download (e.g. preset_YYYY-MM-DD_HHMM.json).
   Example:
   const blob = new Blob([JSON.stringify(synthState, null, 2)], { type: 'application/json' });
   const url = URL.createObjectURL(blob);
   const a = document.createElement('a');
   a.href = url;
   a.download = preset_${Date.now()}.json;
   a.click();

3. Load Preset (Import)
   Add a Load Preset button with a file input.
   On file selection:
   Read and parse JSON using FileReader.
   Validate the structure (check keys like waveform, ADSR, EQ, etc.).
   Update all corresponding UI elements and internal synth parameters.

4. UI Feedback & Validation
   Show toast notifications for success or error (e.g. “Preset loaded successfully!” / “Invalid preset file”).
   Wrap file parsing in a try…catch for safety.

5. Optional Enhancements
   Store recently used presets in localStorage for quick reuse.
   Add a “Reset to Default” option.

these are my approach , you can suggest me whether it suits you requirement and whether i can continue or not

[baync180705]

Cool, @devanshu-puri ! go ahead, I am assigning the issue to you.

[devanshu-puri]

@baync180705 , @mohitvermax I MADE THE CHANGES KINDLY REVIEW IT

[baync180705]

@devanshu-puri yes, we are reviewing your work, we are sorry for the delay.

[devanshu-puri]

@baync180705 can you update me if this a pr , can be merged or something?

[baync180705]

Hey @devanshu-puri, I hope you were updated on this issue by @MeetCoding
If you have doubts, you can approach us for the same.

[devanshu-puri]

what's the issue? is there anything to do in the code. i request you to respond and update on time
thank you

[baync180705]

@devanshu-puri try to test the preset load and save functionality once. Only the ADSR values are getting loaded while the octave number, waveform, eq values are not.