Step 1, Attenuation = Infinity dB, Rx = 10000 ohms, Ry = 0 ohms.

Step 2, Attenuation = 75 dB, Rx = 10000 ohms, Ry = 2 ohms.

Step 3, Attenuation = 72 dB, Rx = 10000 ohms, Ry = 3 ohms.

Step 4, Attenuation = 69 dB, Rx = 10000 ohms, Ry = 4 ohms.

Step 5, Attenuation = 66 dB, Rx = 10000 ohms, Ry = 5 ohms.

Step 6, Attenuation = 63 dB, Rx = 10000 ohms, Ry = 7 ohms.

Step 7, Attenuation = 60 dB, Rx = 10000 ohms, Ry = 10 ohms.

Step 8, Attenuation = 58 dB, Rx = 10000 ohms, Ry = 13 ohms.

Step 9, Attenuation = 56 dB, Rx = 10000 ohms, Ry = 16 ohms.

Step 10, Attenuation = 54 dB, Rx = 10000 ohms, Ry = 20 ohms.

Step 11, Attenuation = 52 dB, Rx = 10000 ohms, Ry = 25 ohms.

Step 12, Attenuation = 50 dB, Rx = 10000 ohms, Ry = 32 ohms.

Step 13, Attenuation = 48 dB, Rx = 10000 ohms, Ry = 40 ohms.

Step 14, Attenuation = 46 dB, Rx = 10000 ohms, Ry = 50 ohms.

Step 15, Attenuation = 44 dB, Rx = 10000 ohms, Ry = 63 ohms.

Step 16, Attenuation = 42 dB, Rx = 10000 ohms, Ry = 80 ohms.

Step 17, Attenuation = 40 dB, Rx = 10000 ohms, Ry = 101 ohms.

Step 18, Attenuation = 38 dB, Rx = 10000 ohms, Ry = 127 ohms.

Step 19, Attenuation = 36 dB, Rx = 10000 ohms, Ry = 161 ohms.

Step 20, Attenuation = 34 dB, Rx = 10000 ohms, Ry = 204 ohms.

Step 21, Attenuation = 32 dB, Rx = 10000 ohms, Ry = 258 ohms.

Step 22, Attenuation = 30 dB, Rx = 10000 ohms, Ry = 327 ohms.

Step 23, Attenuation = 28 dB, Rx = 10000 ohms, Ry = 415 ohms.

Thanks for help.