Here is how I play X, I'm pretty sure it's right, I saw the books version, and mine is basically the same
Regular SoAD tuning- D A F C G C
Intro
P.M.-----------------|
D--------------------|
A--------------------|
F--------------------|
C10p0-12p0-13p0-12p0-|
G--------------------|
C--------------------|
Repeat a few times then play this with pinch harmonics
D-------------|
A-------------|
F-------------|
C-10-12-13-12-|
G-------------|
C-------------|
[ Tab from: https://www.guitartabs.cc/tabs/s/system_of_a_down/x_tab_ver_3.html ]
Little Interlude bit:
D--------------------------------------------------|
A--------------------------------------------------|
F-------------9/10-10-10---------------------------|
C------------10/11-11-11---------------------------|
G0-0-0-0-0-0--------------0-0-0-0-0-0-10/13-13-13--|
C0-0-0-0-0-0--------------0-0-0-0-0-0-10/13-13-13--|
It ends with this
P.M.--|
D---------|
A---------|
F---------|
C---------|
G10-13-13-|
C10-13-13-|
Verse Bit (Tell your people......)
PM-----------|
D------------|
A------------|
F------------|
C------------|
G10-12-13-12-|
C10-12-13-12-|
When it says we don't need to multiply, release p.m.
When he sings no need to nullify, add the p.m. again.
Bridge part
P.M.-------| |---| |---------| |------------|
D-----------10^----10^----------10^-------------|
A-----------------------------------------------|
F-----------------------------------------------|
C-----------------------------------------------|
G-0-0-0-0-0------0------0-0-0-0-----10-12-13-12-|
C-0-0-0-0-0------0------0-0-0-0-----10-12-13-12-|
Thats it, thats all there is