Play sound on 1 speaker using AudioTrack

Question

My android tablet has 4 speakers, 2 at the top and 2 at the bottom. I successfully generated a beep sound with specific frequency using AudioTrack, based from the codes I found somewhere in stackoverflow. (I forgot the link)

    val duration = duration // Seconds
    var freq = frequency // frequency
    val sampleRate = 44100

    val numSamples = (duration * sampleRate) * 2
    val samples = DoubleArray(numSamples)
    val buffer = ShortArray(numSamples)

    for (i in 0 until numSamples) {
        samples[i] = Math.sin(2 * Math.PI * i / (sampleRate / freq)) // Sine wave
        buffer[i] =
        (samples[i] * Short.MAX_VALUE).toInt().toShort() 
    }

    val audioTrack = AudioTrack(
        AudioManager.STREAM_MUSIC,
        sampleRate, AudioFormat.CHANNEL_OUT_MONO,
        AudioFormat.ENCODING_PCM_16BIT, buffer.size,
        AudioTrack.MODE_STREAM
    )
    audioTrack.write(buffer, 0, buffer.size)
    audioTrack.play()

The problem is, I want to play the beep on 1 of the speaker. I can select which speaker it will play. Is it possible? How will I able to achieve that?

PS: This is my first time posting here in stackoverflow