[MTCD Software Development] Wadzio:
I spent some time and I prepared SoundPatch similar to 7floor modification.

The difference is: It's no need any hardware modification, only patched MCU firmware and modified android Amplifier apk

That's how it looks:

Remember

I am not responsible for anything that may happen to your unit by flashing the mod image.

You do it at your own risk and take the responsibility upon yourself.

Update 18-08-2019 (remarks below)

[MENTION=6608913]adrianpop1990 [/MENTION] has prepared repository on GitHub. Many thanks for him

If someone are interested in contribute this mod please look at https://github.com/avp90/MTCAmpSetupBD375XXMod

Links:

Patched MCU firmwares:

MTCE_CHS → MTCE_CHS_3.15bd.zip | MTCE_CHS_3.10bd.zip

MTCE_CZ  → MTCE_CZ_2.97bd.zip

MTCE_GS  → MTCE_GS_3.17bd.zip | MTCE_GS_3.10bd.zip | MTCE_GS_3.07bd.zip | View attachment 4672655 | MTCE_GS_2.94bd.zip | MTCE_GS_2.93bd.zip | MTCE_GS_2.88bd.zip

MTCE_HA  → MTCE_HA_3.14bd.zip | MTCE_HA_3.10bd.zip | MTCE_HA_3.06bd.zip | View attachment 4672656 | MTCE_HA_2.89bd.zip | MTCE_HA_2.88bd.zip

MTCE_HT  → MTCE_HT_3.03bd.zip

MTCE_HXD → MTCE_HXD_3.06bd.zip | View attachment 4672657 | MTCE_HXD_2.93bd.zip | MTCE_HXD_2.86bd.zip

MTCE_KGL → MTCE_KGL_3.10bd.zip | View attachment 4672658

MTCE_KLD → MTCE_KLD_3.01bd.zip | View attachment 4672659 | MTCE_KLD_2.88bd.zip

MTCE_KSP → View attachment 4672660 | MTCE_KSP_2.89bd.zip

MTCE_LM  → MTCE_LM_3.16bd.zip | MTCE_LM_3.10bd.zip | MTCE_LM_3.06bd.zip | MTCE_LM_3.01cbd.zip | View attachment 4628564

MTCE_MX  → MTCE_MX_3.13bd.zip | MTCE_MX2_3.13bd.zip | MTCE_MX_3.08bd.zip | MTCE_MX_3.06bd.zip | View attachment 4672661 | MTCE_MX_2.94bd.zip | MTCE_MX_2.91bd.zip | MTCE_MX_2.90bd.zip

MTCE_OLS → MTCE_OLS_3.12bd.zip

MTCE_PSD → View attachment 4672662

MTCE_TONE→ MTCE_TONE_3.17bd.zip | MTCE_TONE_3.06bd.zip

MTCE_WWW → View attachment 4672663

MTCE_XRC → MTCE_XRC_3.01bd.zip | View attachment 4672664 | MTCE_XRC_2.89bd.zip | MTCE_XRC2_2.84bd.zip

MTCE_YB  → MTCE_YB_3.10bd.zip | MTCE_YB_3.08bd.zip

MTCE_YL  → MTCE_YL_3.10bd.zip

Modified Amplifier apk:

MTCAmpSetupMOD→View attachment 4674563 (View attachment 4586584) - It installs as a separate application

MTCAmpSetupROOT→View attachment 4674564 (View attachment 4586586) - Replaces the original/buildin MTCAmpSetup application (Android must be rooted)

* Notice *

Some users reported issue with installing ROOT version (I did not have that problem and still have not).

Possible solutions at posts: #486, #542, #552

Revert to previous version:

Flash your original MCU firmware

Amplifier apk:

If you installed only MOD version, uninstall it

If you applied ROOT version you must install original version MTCAmpSetup.apk

MTCAmpSetup→View attachment 4582361 (mirror) - from Android 6

MTCAmpSetup8→View attachment 4582362 (mirror)- from Anrodid 8

MTCAmpSetupHCT3→View attachment 4582363 (mirror)- from Malaysk ROM

Inconveniences what I noticed:

In Music app, the button marked in red (below) works not properly when Amplifier app not running in the background

View attachment 4582352

Have a nice fun/use/whatever :)

Update:

18-08-2019 - new MCU CHS_3.15bd, CZ_2.97bd, GS_3.17bd, GS_3.10bd, HA_3.14bd, LM_3.16bd, MX_3.13bd, MX2_3.13bd, OLS_3.12bd, TONE_3.17bd, YB_3.10bd, YL_3.10bd preapred by [MENTION=9742148]2uPGodCnrwa[/MENTION]

06-05-2019 - new MCU CHS_3.10bd, HA_3.10bd, HT_3.03bd, HXD_3.06bd, KGL_3.10bd, MX_3.08bd, YB_V3.08bd preapred by [MENTION=9742148]2uPGodCnrwa[/MENTION] (link)

04-05-2019 - new MCU LM_3.06bd, HA_3.06bd, GS_3.07bd, MX_3.06bd, XRC_3.01bd, KLD_3.01bd, TONE_3.06bd preapred by [MENTION=9742148]2uPGodCnrwa[/MENTION] (link)

18-02-2019 - new MCU LM_3.01cbd preapred by [MENTION=9742148]2uPGodCnrwa[/MENTION] (link)

27-12-2018 - AmpSetupMOD & ROOT updated (restoring settings after cold reboot and range subwoofer is configurable after click/touch SUB label) LINK

25-12-2018 - new MCUs GS_3.00bd, HA_2.99bd, HXD_2.95bd, KGL_2.96bd, KLD_2.94bd, KSP_3.00bd, MX_3.00bd, PSD_2.88bd, WWW_2.94bd, XRC_2.94bd

27-10-2018 - corrected MCUs GS_2.94bd, MTCE_HA_2.89bd, HXD_2.93bd, MTCE_KLD_2.88bd, KSP_2.89bd, MTCE_LM_2.88bd, MX_2.94bd, XRC_2.89bd (restoring preamp settings after wakeup)

16-10-2018 - new MCUs GS_2.94bd, HXD_2.93bd, KSP_2.89bd, MX_2.94bd, XRC_2.89bd

01-10-2018 - added link to GitHub repository. Thanks [MENTION=6608913]adrianpop1990 [/MENTION]

13-09-2018 - new MCUs GS_2.93bd, HA_2.89bd, MX_2.91bd

03-09-2018 - corrected MCU for MX_2.90

02-09-2018 - new MCU's and MTCAmpSetupMOD & ROOT: loudness Gain and HiCut

28-08-2018 - MTCAmpSetupMOD & ROOT: ability to change the slider value even without releasing it

Please don't ask for patched MCU firmware for other versions & other manufactures. Maybe, if I will find more free time, I will prepare more versions.