inverse continuous wavelet transform and [Parm] in cwtft

inverse continuous wavelet transform and [Parm] in cwtft

what is 'parm' means when you set the name of wavelet function in cwtft or
icwtft. wave = {wname,[7.6]}. also can I change Fb and Fc when I use
'morl' function in cwtft or icwtft transform? and If not, then how can I
reconstruct my signal with cwt transform? cause cwt let me to select
optional value for fb and fc (cmorfb-fc). Matlab doesn't have direct
function for inverse wavelet transform.
N = 1024;
t = linspace(0,1,N);
y = sin(2*pi*8*t).*(t<=0.5)+sin(2*pi*16*t).*(t>0.5);
dt = 0.05;s0 = 2*dt;ds = 0.4875;NbSc = 20;
wname = 'morl';sig = {y,dt};sca = {s0,ds,NbSc};
*wave = {wname,[7.6]}*;
cwtsig = cwtft(sig,'scales',sca,'wavelet',wave);
sigrec = icwtft(cwtsig,'signal',sig,'plot');