Making friends with the software above, but some problems keep raising. First of all, I know that theoretically my MCMC construction should stop if I type the command stoppb , but it won't even let me type any more as soon as chain construction begins (my cmd goes completely deaf, even though the chain is being constructed). Secondly, how do I change the substitution model? If I wanted to use LG for example, what would the right command be? For me it only starts without errors if I type pb -d , but in this syntax the model is the one given default. How do I build in the model parameter? (in the manual it just gives you the models available but no examples on how to change this parameter are given)