FM Synthesizer [SynprezFM II]

The FM Synthesizer (SynprezFM II) is a versatile, programmable polyphonic synth that offers musicians a wealth of sound creation opportunities through 1024 built-in instrument patches. Utilizing Frequency Modulation synthesis, it adeptly generates intricate harmonic waveforms, making it ideal for crafting analog-style pads, emulating traditional or modern instruments, and inventing novel, crystalline sounds.

With its multitouch dynamic keyboard, the software enables users to produce music with a range of effects, an arpeggio feature, and the convenience of a portable setup. It is not only robust in its sound creation capabilities but also doubles as a precision Yamaha DX7 emulator, enhancing user experience by accurately rendering sysex files.

A notable feature for musicians is the ability to craft and store custom patches. Users may edit existing patches or begin from scratch using the 'init voice' function. It also fully supports recording in WAV format and the connection of MIDI keyboards via USB/OTG for Android Honeycomb 3.1+ or Bluetooth Low Energy for Android Jelly Bean 4.3+. The inclusion of a step sequencer adds to the functionality of the game.

For live performances, the system introduces a dynamic after-touch vibrato effect, multiple octave shifts, and accessible performance parameters for nuanced control. The polyphony adjustment feature ensures smooth playback tailored to each device's capabilities, offering up to 16 channels of simultaneous audio even on mid-range devices.

Advanced users will appreciate the 'expert mode,' which unlocks complex functions like patch editing and a micro-tuning feature, adding further depth to the customization options.

Even with its advanced features, SynprezFM II is designed to be user-friendly. Interface enhancements include wireless Bluetooth MIDI support, a "MIDI slave" feature, and seamless interaction with multiple MIDI keyboards. Volume and balance control have been refined and integrated with MIDI for precision adjustments.

Overall, FM Synthesizer presents a balanced combination of sophistication and usability for those seeking a comprehensive synthesizer experience on their mobile device. With continual improvements such as bug fixes and evolving features like improved MIDI compatibility and enhanced storage access, the platform ensures smooth operation across various Android versions.