ZXMAK2 v2.9.1.38194 Beta is released. ZXMAK2 is plugin based ZX Spectrum Virtual Machine. On the other side, this is flexible ZX Spectrum emulator. Project written in C#. Currently it works on Windows platform and using Managed DirectX.

Support the following ZX Spectrum clones:
- ZX Spectrum 48 (later model contended memory)
- ZX Spectrum 128 (later model contended memory)
- Pentagon 128
- SCORPION 256
- ATM 450
- PROFI 5xx
- QUORUM 256
- Leningrad 1
- Other (through custom configuration and plugins, for example LEC mod)

ZXMAK2 v2.9.1.38194 Beta Changelog:
- reworked sound subsystem, improved sync stability;
- new AY8910 emulation with oversampling and best sound quality;
- added ability to change soundcard sample rate (currently through unity.config only, see sampleRate value of HostSound_Mdx in winforms container);
- added ability to change AY frequency, pan (ABC, ACB, BAC, BCA, CAB, CBA, MONO) and AY DAC preset (currently there is no UI to configure it, so you can change it directly in the machine config file - ZXMAK2.VMZ);
- fixed interrupt length for Spectrum 48 late ULA;
- added beeper DAC/MIC emulation (used for original ZX48/128);
- fixed crackling sound on startup;
- fixed error with Load/Save data block from debugger;
- fixed close hang for XNA4 host;
- fixed some port masks for ATM & Scorpion configs;
- fixed UI lags (debugger);
- improved sound buffering, all locks were removed (now it works with concurrent algorithm), so it will never slow down UI thread;

The most important change in this release is a sound quality improvement which is really impressive :) Also emulator run faster and smoother.

Download: ZXMAK2 v2.9.1.38194 Beta
Source: Here