I built a custom sound tuning tools for linux-based Walkman players
Hi everyone,
I recently organized and published a research project around custom tuning on linux-based Sony Walkman players:
https://github.com/neoncloud/walkman-tuning-guide
The goal is to convert AutoEq / PEQ parameters into CXD3778GF (known as S-Master) tone tables that can be loaded by Walkman players, giving A / ZX / WM series devices a much more flexible headphone correction path than the stock 10-band EQ.
The main finding is that some Sony Walkman players expose a CXD3778GF audio path with an internal tone-control table. Based on firmware/kernel research and hardware testing, this table can be modeled as five cascaded second-order IIR / biquad filters. Sony’s stock firmware also appears to select different tone tables depending on headphone/output cases.
The project currently includes:
- AutoEq / PEQ to CXD3778GF tone-table conversion tools
- direct table-write flow for A-series players
- a helper kernel module for ZX300A to force the table into codec tone RAM
- an example of Moondrop Blessing 3 sample tuning table
- backup, deployment, and restore documentation
- algorithm notes and reproducible experiment scripts
I have tested the workflow on NW-A50 and NW-ZX300A. On A-series devices, the table can be applied more directly. On ZX300A-class devices, the stock kernel updates the in-memory table but does not automatically reload the codec tone RAM, so a helper module is needed.
Important warning: this is still a research project. Please back up your device before trying anything, ideally including system partitions / a full-device backup. The workflow involves ADB, /proc writes, and on some models kernel modules. It is not something I would recommend trying blindly if you are not comfortable with recovery procedures.
If anyone here is interested in Walkman firmware, AutoEq, or low-level tuning on A / ZX / WM series players, I would love feedback, issues, corrections, or test reports from other models.