public link unit tone1 {} = driver.tone1;
public link bit Vol1 = driver.vol1;
public link bit Freq1 = driver.freq1;
public link bit Vol2 = driver.vol2;
public link bit Freq2 = driver.freq2;
public link bit Start1 = driver.Start1;
public link bit Start2 = driver.Start2;
public link void OS_init(){} = driver.OS_init;
