Hi Gang,
Yes, the quantitative variable does vary within subject. According to my data table I have 2 within subject factors with three levels each and the one quantitative variable. It is a RM design. Will 3dLME handle this model. Looking at the help file, it seems it may limited to one within subject factor.

Thanks,
Tim

3dMVM -prefix tDCSpinprickprobecentpainintGLMblock4 -jobs 4 \
-bsVars 1 \
-wsVars "probeforce*treatment" \
-wsE2 \
-qVars probecentpainint \
-num_glt 23 \
-gltLabel 1 512_vs_256 -gltCode 1 probeforce : 1*Lar -1*Med \
-gltLabel 2 512_vs_128 -gltCode 2 probeforce : 1*Lar -1*Sma \
-gltLabel 3 256_vs_128 -gltCode 3 probeforce : 1*Med -1*Sma \
-gltLabel 4 anode_vs_sham -gltCode 4 treatment : 1*anode -1*sham \
-gltLabel 5 cathode_vs_sham -gltCode 5 treatment : 1*cathode -1*sham \
-gltLabel 6 anode_vs_cathode -gltCode 6 treatment : 1*anode -1*cathode \
-gltLabel 7 anode_vs_shampainintcov -gltCode 7 treatment : 1*anode -1*sham probecentpainint : \
-gltLabel 8 cathode_vs_shampainintcov -gltCode 8 treatment : 1*cathode -1*sham probecentpainint : \
-gltLabel 9 anode_vs_cathodepainintcov -gltCode 9 treatment : 1*anode -1*cathode probecentpainint : \
-gltLabel 10 mean128 -gltCode 10 probeforce : 1*Sma \
-gltLabel 11 mean256 -gltCode 11 probeforce : 1*Med \
-gltLabel 12 mean512 -gltCode 12 probeforce : 1*Lar \
-gltLabel 13 mean128covpainint -gltCode 13 probeforce : 1*Sma probecentpainint : \
-gltLabel 14 mean256covpainint -gltCode 14 probeforce : 1*Med probecentpainint : \
-gltLabel 15 mean512covpainint -gltCode 15 probeforce : 1*Lar probecentpainint : \
-gltLabel 16 meananode -gltCode 16 treatment : 1*anode \
-gltLabel 17 meancathode -gltCode 17 treatment : 1*cathode \
-gltLabel 18 meansham -gltCode 18 treatment : 1*sham \
-gltLabel 19 meananodepainintcov -gltCode 19 treatment : 1*anode probecentpainint : \
-gltLabel 20 meancathodepainintcov -gltCode 20 treatment : 1*cathode probecentpainint : \
-gltLabel 21 meanshampainintcov -gltCode 21 treatment : 1*sham probecentpainint : \
-gltLabel 22 activetreat_vs_sham -gltCode 22 treatment : 1*anode +1*cathode -2*sham \
-gltLabel 23 activetreat_vs_shampainintcov -gltCode 23 treatment : 1*anode +1*cathode -2*sham probecentpainint : -SC \
-dataTable \
Subj probeforce treatment probecentpainint InputFile \
ctd002 Sma anode 35.7037037 Smastats.ctd002anodepph2block4+tlrc \
ctd002 Sma cathode -10.96296296 Smastats.ctd002cathodepph2block4+tlrc \
ctd002 Sma sham -4.296296296 Smastats.ctd002shampph2block4+tlrc \
ctd002 Med anode 19.03703704 Medstats.ctd002anodepph2block4+tlrc \
ctd002 Med cathode -7.62962963 Medstats.ctd002cathodepph2block4+tlrc \
ctd002 Med sham -5.962962963 Medstats.ctd002shampph2block4+tlrc \
ctd002 Lar anode 19.03703704 Larstats.ctd002anodepph2block4+tlrc \
ctd002 Lar cathode -9.296296296 Larstats.ctd002cathodepph2block4+tlrc \
ctd002 Lar sham 12.37037037 Larstats.ctd002shampph2block4+tlrc \
ctd009 Sma anode -8.962962963 Smastats.ctd009anodepph2block4+tlrc \
ctd009 Sma cathode 7.037037037 Smastats.ctd009cathodepph2block4+tlrc \
ctd009 Sma sham -7.62962963 Smastats.ctd009shampph2block4+tlrc \
ctd009 Med anode -10.96296296 Medstats.ctd009anodepph2block4+tlrc \
ctd009 Med cathode -14.2962963 Medstats.ctd009cathodepph2block4+tlrc \
ctd009 Med sham -14.2962963 Medstats.ctd009shampph2block4+tlrc \
ctd009 Lar anode 25.7037037 Larstats.ctd009anodepph2block4+tlrc \
ctd009 Lar cathode -14.2962963 Larstats.ctd009cathodepph2block4+tlrc \
ctd009 Lar sham -7.62962963 Larstats.ctd009shampph2block4+tlrc \
ctd011 Sma anode 0.703703704 Smastats.ctd011anodepph2block4+tlrc \
ctd011 Sma cathode 22.37037037 Smastats.ctd011cathodepph2block4+tlrc \
ctd011 Sma sham -2.62962963 Smastats.ctd011shampph2block4+tlrc \
ctd011 Med anode 9.037037037 Medstats.ctd011anodepph2block4+tlrc \
ctd011 Med cathode -10.96296296 Medstats.ctd011cathodepph2block4+tlrc \
ctd011 Med sham 12.37037037 Medstats.ctd011shampph2block4+tlrc \
ctd011 Lar anode -11.62962963 Larstats.ctd011anodepph2block4+tlrc \
ctd011 Lar cathode 0.703703704 Larstats.ctd011cathodepph2block4+tlrc \
ctd011 Lar sham -5.962962963 Larstats.ctd011shampph2block4+tlrc \
ctd015 Sma anode -11.62962963 Smastats.ctd015anodepph2block4+tlrc \
ctd015 Sma cathode -14.2962963 Smastats.ctd015cathodepph2block4+tlrc \
ctd015 Sma sham -14.2962963 Smastats.ctd015shampph2block4+tlrc \
ctd015 Med anode 35.7037037 Medstats.ctd015anodepph2block4+tlrc \
ctd015 Med cathode 2.37037037 Medstats.ctd015cathodepph2block4+tlrc \
ctd015 Med sham -4.296296296 Medstats.ctd015shampph2block4+tlrc \
ctd015 Lar anode 12.37037037 Larstats.ctd015anodepph2block4+tlrc \
ctd015 Lar cathode 5.703703704 Larstats.ctd015cathodepph2block4+tlrc \
ctd015 Lar sham -7.62962963 Larstats.ctd015shampph2block4+tlrc \
ctd017 Sma anode 12.37037037 Smastats.ctd017anodepph2block4+tlrc \
ctd017 Sma cathode -1.962962963 Smastats.ctd017cathodepph2block4+tlrc \
ctd017 Sma sham 5.703703704 Smastats.ctd017shampph2block4+tlrc \
ctd017 Med anode -13.62962963 Medstats.ctd017anodepph2block4+tlrc \
ctd017 Med cathode 10.7037037 Medstats.ctd017cathodepph2block4+tlrc \
ctd017 Med sham -9.296296296 Medstats.ctd017shampph2block4+tlrc \
ctd017 Lar anode -7.62962963 Larstats.ctd017anodepph2block4+tlrc \
ctd017 Lar cathode -5.962962963 Larstats.ctd017cathodepph2block4+tlrc \
ctd017 Lar sham -10.96296296 Larstats.ctd017shampph2block4+tlrc \
ctd020 Sma anode 40.75555556 Smastats.ctd020anodepph2block4+tlrc \
ctd020 Sma cathode 5.755555556 Smastats.ctd020cathodepph2block4+tlrc \
ctd020 Sma sham -10.91111111 Smastats.ctd020shampph2block4+tlrc \
ctd020 Med anode 22.42222222 Medstats.ctd020anodepph2block4+tlrc \
ctd020 Med cathode -4.244444444 Medstats.ctd020cathodepph2block4+tlrc \
ctd020 Med sham -12.57777778 Medstats.ctd020shampph2block4+tlrc \
ctd020 Lar anode 9.088888889 Larstats.ctd020anodepph2block4+tlrc \
ctd020 Lar cathode -6.911111111 Larstats.ctd020cathodepph2block4+tlrc \
ctd020 Lar sham 22.42222222 Larstats.ctd020shampph2block4+tlrc \
ctd025 Sma anode -7.577777778 Smastats.ctd025anodepph2block4+tlrc \
ctd025 Sma cathode 14.08888889 Smastats.ctd025cathodepph2block4+tlrc \
ctd025 Sma sham -15.91111111 Smastats.ctd025shampph2block4+tlrc \
ctd025 Med anode -9.244444444 Medstats.ctd025anodepph2block4+tlrc \
ctd025 Med cathode -17.57777778 Medstats.ctd025cathodepph2block4+tlrc \
ctd025 Med sham -17.24444444 Medstats.ctd025shampph2block4+tlrc \
ctd025 Lar anode 29.08888889 Larstats.ctd025anodepph2block4+tlrc \
ctd025 Lar cathode -14.24444444 Larstats.ctd025cathodepph2block4+tlrc \
ctd025 Lar sham -10.91111111 Larstats.ctd025shampph2block4+tlrc \
ctd029 Sma anode 5.755555556 Smastats.ctd029anodepph2block4+tlrc \
ctd029 Sma cathode 15.75555556 Smastats.ctd029cathodepph2block4+tlrc \
ctd029 Sma sham -5.911111111 Smastats.ctd029shampph2block4+tlrc \
ctd029 Med anode 9.088888889 Medstats.ctd029anodepph2block4+tlrc \
ctd029 Med cathode -9.244444444 Medstats.ctd029cathodepph2block4+tlrc \
ctd029 Med sham 5.755555556 Medstats.ctd029shampph2block4+tlrc \
ctd029 Lar anode -19.24444444 Larstats.ctd029anodepph2block4+tlrc \
ctd029 Lar cathode 9.088888889 Larstats.ctd029cathodepph2block4+tlrc \
ctd029 Lar sham -9.244444444 Larstats.ctd029shampph2block4+tlrc \
ctd036 Sma anode -12.57777778 Smastats.ctd036anodepph2block4+tlrc \
ctd036 Sma cathode -20.91111111 Smastats.ctd036cathodepph2block4+tlrc \
ctd036 Sma sham -18.57777778 Smastats.ctd036shampph2block4+tlrc \
ctd036 Med anode 22.42222222 Medstats.ctd036anodepph2block4+tlrc \
ctd036 Med cathode 22.42222222 Medstats.ctd036cathodepph2block4+tlrc \
ctd036 Med sham -4.244444444 Medstats.ctd036shampph2block4+tlrc \
ctd036 Lar anode 17.42222222 Larstats.ctd036anodepph2block4+tlrc \
ctd036 Lar cathode 25.75555556 Larstats.ctd036cathodepph2block4+tlrc \
ctd036 Lar sham -10.91111111 Larstats.ctd036shampph2block4+tlrc \
ctd037 Sma anode 2.422222222 Smastats.ctd037anodepph2block4+tlrc \
ctd037 Sma cathode -5.911111111 Smastats.ctd037cathodepph2block4+tlrc \
ctd037 Sma sham 9.088888889 Smastats.ctd037shampph2block4+tlrc \
ctd037 Med anode -13.24444444 Medstats.ctd037anodepph2block4+tlrc \
ctd037 Med cathode 17.42222222 Medstats.ctd037cathodepph2block4+tlrc \
ctd037 Med sham -15.91111111 Medstats.ctd037shampph2block4+tlrc \
ctd037 Lar anode -5.911111111 Larstats.ctd037anodepph2block4+tlrc \
ctd037 Lar cathode -9.244444444 Larstats.ctd037cathodepph2block4+tlrc \
ctd037 Lar sham -17.57777778 Larstats.ctd037shampph2block4+tlrc \
ctd038 Sma anode 29.92592593 Smastats.ctd038anodepph2block4+tlrc \
ctd038 Sma cathode 3.259259259 Smastats.ctd038cathodepph2block4+tlrc \
ctd038 Sma sham -10.07407407 Smastats.ctd038shampph2block4+tlrc \
ctd038 Med anode 34.92592593 Medstats.ctd038anodepph2block4+tlrc \
ctd038 Med cathode -6.740740741 Medstats.ctd038cathodepph2block4+tlrc \
ctd038 Med sham -10.07407407 Medstats.ctd038shampph2block4+tlrc \
ctd038 Lar anode 13.25925926 Larstats.ctd038anodepph2block4+tlrc \
ctd038 Lar cathode -8.407407407 Larstats.ctd038cathodepph2block4+tlrc \
ctd038 Lar sham 6.592592593 Larstats.ctd038shampph2block4+tlrc \
ctd042 Sma anode -15.07407407 Smastats.ctd042anodepph2block4+tlrc \
ctd042 Sma cathode 14.92592593 Smastats.ctd042cathodepph2block4+tlrc \
ctd042 Sma sham -18.40740741 Smastats.ctd042shampph2block4+tlrc \
ctd042 Med anode -6.740740741 Medstats.ctd042anodepph2block4+tlrc \
ctd042 Med cathode -18.40740741 Medstats.ctd042cathodepph2block4+tlrc \
ctd042 Med sham -19.74074074 Medstats.ctd042shampph2block4+tlrc \
ctd042 Lar anode 33.25925926 Larstats.ctd042anodepph2block4+tlrc \
ctd042 Lar cathode -6.740740741 Larstats.ctd042cathodepph2block4+tlrc \
ctd042 Lar sham -13.40740741 Larstats.ctd042shampph2block4+tlrc \
ctd043 Sma anode 11.59259259 Smastats.ctd043anodepph2block4+tlrc \
ctd043 Sma cathode 29.92592593 Smastats.ctd043cathodepph2block4+tlrc \
ctd043 Sma sham -8.407407407 Smastats.ctd043shampph2block4+tlrc \
ctd043 Med anode 9.925925926 Medstats.ctd043anodepph2block4+tlrc \
ctd043 Med cathode -8.407407407 Medstats.ctd043cathodepph2block4+tlrc \
ctd043 Med sham 13.25925926 Medstats.ctd043shampph2block4+tlrc \
ctd043 Lar anode -18.07407407 Larstats.ctd043anodepph2block4+tlrc \
ctd043 Lar cathode 8.259259259 Larstats.ctd043cathodepph2block4+tlrc \
ctd043 Lar sham -11.74074074 Larstats.ctd043shampph2block4+tlrc \
ctd044 Sma anode -12.74074074 Smastats.ctd044anodepph2block4+tlrc \
ctd044 Sma cathode -23.40740741 Smastats.ctd044cathodepph2block4+tlrc \
ctd044 Sma sham -9.740740741 Smastats.ctd044shampph2block4+tlrc \
ctd044 Med anode 26.59259259 Medstats.ctd044anodepph2block4+tlrc \
ctd044 Med cathode 3.259259259 Medstats.ctd044cathodepph2block4+tlrc \
ctd044 Med sham -6.740740741 Medstats.ctd044shampph2block4+tlrc \
ctd044 Lar anode 28.25925926 Larstats.ctd044anodepph2block4+tlrc \
ctd044 Lar cathode 16.59259259 Larstats.ctd044cathodepph2block4+tlrc \
ctd044 Lar sham -11.74074074 Larstats.ctd044shampph2block4+tlrc \
ctd047 Sma anode 6.592592593 Smastats.ctd047anodepph2block4+tlrc \
ctd047 Sma cathode -6.740740741 Smastats.ctd047cathodepph2block4+tlrc \
ctd047 Sma sham 13.25925926 Smastats.ctd047shampph2block4+tlrc \
ctd047 Med anode -11.74074074 Medstats.ctd047anodepph2block4+tlrc \
ctd047 Med cathode 11.59259259 Medstats.ctd047cathodepph2block4+tlrc \
ctd047 Med sham -16.74074074 Medstats.ctd047shampph2block4+tlrc \
ctd047 Lar anode -13.40740741 Larstats.ctd047anodepph2block4+tlrc \
ctd047 Lar cathode -8.407407407 Larstats.ctd047cathodepph2block4+tlrc \
ctd047 Lar sham -13.40740741 Larstats.ctd047shampph2block4+tlrc \