Jeep Chart 10-1P1 for VMMC/MFM Para 3.3 Noise Abatement Procedures says:
"Take-off on RWY 34
- Climb offset 15 degrees (Right) to 400', turn RIGHT
- Do not overshoot ZAU R-230, which defines the northern limit for flights taking off on RWY 34 due to noise abatement for Zhuhai City"
Therefore, before take off set HDG to 358. After lift off, FMA is "RWY TRK". When safe to do so (over Departure End of Runway (DER)?), "Pull HDG" and obey FDs. At 400', "Push NAV". But it all depends on how the SID is coded in your FMGC.
BTW, the 394' (or 400) comes from the ICAO which talks about 120M which equals 393.7008ft!
mcdhu