[LAU] Creating evenly spaced sample chains?

Greetings, I'd like to chain samples into one new sample such that each input sample starts at a multiple of a given time value in the output sample (basically an evenly spaced concatenation). All input samples share the same format but differ in length. If a sample is longer than the given time interval it's tail shall be cut off (overwritten by the next one), if it's shorter, silence shall be added to it's end. Do you know of a tool or can you think of a command pipeline that would establish this (putting the samples on the grid in a DAW to export the result is too much work and also would make me feel stupid!)? I tried sox so far but it seems that it's not up to the task. Thanks vvd