Can't create buffers in array in JS (v8)

Hello,I am trying to create arrays of buffers within JS (v8).I have buffers named "start" and "end" in my patcher, both containing a sound, and I want to make some copies of these buffers (only in JS, not in the patch) . Before performing the copies I am trying to dimension the copies according to the original buffers.This code doesn't function. channelcount and framecount performed on any of the new buffers both return -1. I suspect the issue is the way I create the buffers or the array itself. What's wrong?

let hybrid_number = 5; // number of copies
let hybrid_start_buffers = []; // to contain copies of "start"
let hybrid_end_buffers = []; // to contain copies of "end"

// create buffers and copy original samples
function create_hybrid_buffers() {
	let start_buffer = new Buffer("start"); 
	let start_dur_samps = start_buffer.framecount()
	let start_chans = start_buffer.channelcount()
	let end_buffer = new Buffer("end"); 
	let end_dur_samps = end_buffer.framecount()
	let end_chans = end_buffer.channelcount()

// creation of new buffers
for (let i = 0; i < hybrid_number; i++) {
	let my_start_buffer = new Buffer();
	hybrid_start_buffers.push(my_start_buffer);
	let my_end_buffer = new Buffer();
	hybrid_end_buffers.push(my_end_buffer);
	my_start_buffer.send("sizeinsamps", start_dur_samps, start_chans);
	my_end_buffer.send("sizeinsamps", end_dur_samps, end_chans);
}