Simplified Brainwave iOS App Development

We are looking to develop a simplified iOS app for brainwave modulation. The app will feature:

1. UI (Single Screen):
- Programs: Reset / Recovery / Boost
- Volume Controls: Music (0–100%) and Frequency (0–100%)
- Timer Options: 15 / 20 / 25 / 30 minutes with START/STOP controls

2. Audio Engine:
- Signal: Fixed 40 Hz sine wave
- Program Logic with LFO Modulation:
- Reset: 0.1 Hz
- Recovery: 0.7 Hz
- Boost: 3.0 Hz
- Audio Output:
- Channel 1: 40 Hz sine wave
- Channel 2: Background audio with independent volume control

3. Session Logic:
- START → Audio + Timer Start, Program Active
- STOP → Immediate Stop + Reset
- Timer End → Auto Stop

4. Platform Requirements: iOS (iPhone + iPad), Offline Capable

5. Constraints: No user accounts, no data storage, no backend required

6. Future Scope: BLE hardware integration (ESP32) and external vibration device control