Welcome to my guide!
The very first thing you should do is read the MIDIbox Quad Genesis section on the wiki as much as you can:
http://wiki.midibox.org/doku.php?id=midibox_quad_genesis
Especially the MBHP_GENESIS, MBHP_Genesis_LS and MBHP_FP pages.
If you would like to build the wooden case before soldering the electronics then please jump to this post:
Step 1:Installing the MIOS32 Bootloader on STM32F407G-DISC1
This is already explained in the STM32F4 Based Core page on ucapps.de.
Simply scroll down to:
http://ucapps.de/images/bullet.gif Installing the MIOS32 Bootloader
and follow the guide.
Remember that the Micro-USB cable must be inserted upside down on the left hand side of the board.
Step 2: Soldering the Core STM32F4 Breakout board:
This is also already explained on the STM32F4 Based Core page on ucapps.de
Simply scroll down the page further to:
http://ucapps.de/images/bullet.gif Soldering Guide
and follow the instructions.
After the soldering is complete please make sure to set the Jumper at J15_S to 5V, by connecting the 2 pins on the left hand side with the jumper.
This will feed our LCD display with 5 Volts. If your LCD Display uses 3.3V, then put the jumper to the 2 pins on the right hand side.
/edit TK: check if we can edit this posting